Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b73bcca7d700203…

MALICIOUS

PDF

41.4 KB Created: 2020-04-16 00:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: bccba515a19266faa3ea5b9302a49ff5 SHA-1: b951aa4eeb947c0cbae35e06dd4cfbe08baf97ce SHA-256: 3b73bcca7d700203d5a84f786e0eb2128c94e8a4aefe24a1bca6934b28733fec
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which are structured in a way that suggests SEO spam or a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, and 'SE_LOLBIN_RUN_COMMAND' suggests that the document may contain instructions for executing commands, potentially to facilitate further malicious activity. The primary lure appears to be 'Ed sheeran perfect duet sheet music', aiming to attract users interested in music.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://growmygardens.com/uploads/1/3/0/5/130590339/130590339.html#ed+sheeran+perfect+duet+sheet+music PDF link annotation
    • http://finefurnitureco.com/uploads/1/3/0/7/130740191/pefotuvi-ginamomas-valonebajura-jebekosenabugaw.pdfIn PDF document text
    • http://sumitsakhuja.com/uploads/1/3/0/8/130874639/85639f2e8a4c9df.pdfIn PDF document text
    • http://oosterhuisphotography.com/uploads/1/3/0/7/130776558/7252f8c442c1f27.pdfIn PDF document text
    • http://greenelectrical.org/uploads/1/3/1/4/131453598/5715451.pdfIn PDF document text
    • http://riseuptck.com/uploads/1/3/0/7/130738861/57331f2004c.pdfIn PDF document text
    • https://musescore.png@180x252?no-cache=1579301697&bgclr=ffffffIn PDF document text
    • https://musescoreIn PDF document text
    • https://musescore.5In PDF document text
    • https://musescore.1000000000000000055511151231257827021181583404541015625},{In PDF document text
    • https://musescore.musescore.mid?revision=1519216575&no-In PDF document text
    • https://nocdn.com/score/stats/viewIn PDF document text
    • https://musescore.05000000000000000277555756156289135105907917022705078125},{In PDF document text
    • https://musescore.netIn PDF document text
    • https://musescore.05000000000000000277555756156289135105907917022705078125In PDF document text
    • https://musescore.0200000000000000004163336342344337026588618755340576171875In PDF document text
    • https://musescore.040000000000000000832667268468867405317723751068115234375In PDF document text
    • https://musescore.200000000000000011102230246251565404236316680908203125},{In PDF document text
    • https://musescore.1In PDF document text
    • https://musescore.jpgIn PDF document text
    • https://musescore.ultimate-guitar.200000000000000011102230246251565404236316680908203125},{In PDF document text
    • https://musescore.com/user/21585386/scores/5634470/piano-tutorial?from=youtube_shareIn PDF document text
    • https://musescore.com/user/27943981/scores/4986010/embedIn PDF document text
    • https://musescore.com/static/public/img/musescore/piano_rollIn PDF document text
    • https://musescore.com/ug/In PDF document text
    • https://musescore.com/user/27943981/scores/4986010In PDF document text
    • https://musescore.ultimate-guitar.com/user/27943981In PDF document text
    • https://musescore.com/user/27943981In PDF document text
    • https://musescore.com/sheetmusic/artists/beyonceIn PDF document text
    • https://musescore.com/user/21585386\rSupportIn PDF document text
    • https://www.com/score/stats/delayed-viewIn PDF document text
    • https://musescore.com/static/musescore/scoredata/gen/0/1/0/4986010/e9eb740d89505362c92d7cc018d8f0289f467049/score_0.com/user/27943981/scores/4986010In PDF document text
    • https://musescore.openx.netIn PDF document text
    • https://musescore.com/static/musescore/scoredata/gen/0/1/0/4986010/e9eb740d89505362c92d7cc018d8f0289f467049/score.com/static/musescore/scoredata/gen/0/1/0/4986010/e9eb740d89505362c92d7cc018d8f0289f467049/score.mp3?revision=1519216575&no-In PDF document text
    • https://musescore.com/static/musescore/scoredata/gen/0/1/0/4986010/e9eb740d89505362c92d7cc018d8f0289f467049/score.com/static/musescore/scoredata/gen/0/1/0/4986010/e9eb740d89505362c92d7cc018d8f0289f467049/score_0In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7886 9128 bytes
SHA-256: 4b438c41fff315b6dde8d9209327dbbef35f52e2f7a000cc79fc78032d5e7da3