Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8e124ce2151c65…

MALICIOUS

PDF

40.1 KB Created: 2020-09-18 12:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d392f907d379085e5c658029525c1ee9 SHA-1: 5a54c076206be14ab4721fc3583cafde438aab16 SHA-256: 5f8e124ce2151c655e73c8120d1ad045c9d351f08b735b1113820231949bb69c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as malicious redirectors. The document body, though heavily obfuscated, contains URLs that are likely intended to trick users into downloading malware, such as 'snap apk downloader'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://ttraff.link/wix?keyword=snap+apk+downloader
    • http://files.bell-bottom-blues-btq.com/uploads/1/3/1/4/131454126/wopenutusenixuj.pdf
    • http://files.rickloper.com/uploads/1/3/1/3/131383283/rusopejubiveruk.pdf
    • http://jogidawev.tutorslink123.com/uploads/1/3/1/6/131637014/c6efb7a00d1da.pdf
    • http://jutej.wanderingmusicians.com/uploads/1/3/1/4/131437158/7731768.pdf
    • http://pirem.stjohnschurchclinton.org/uploads/1/3/1/6/131637432/bivuzarowekesefef.pdf
    • http://luxogonum.risawilliams.com/uploads/1/3/1/3/131381225/jobugedetudo.pdf
    • http://lufowup.goodshortstories.net/uploads/1/3/1/3/131380755/vuvaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/75659158930.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/3947755754.pdf
    • https://cdn.shopify.com/s/files/1/0433/9816/8743/files/mathematical_statistics_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/ansible_commands_cheat_sheet.pdf
    • https://7336b526-0718-4056-956f-140331bde883.filesusr.com/ugd/49be48_12d5d48fcf144f20a79f4a84ce55d76f.pdf?index=true
    • https://482774df-af73-4b9a-a8f0-08de4374c16d.filesusr.com/ugd/cf79db_37cdd17ede154e778ed2610c6c257061.pdf?index=true
    • https://70b615b2-bada-4c17-ac76-e83238b4d00f.filesusr.com/ugd/b916f4_020c3e218c104cc98eea50403990068b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f56.bin
7d21636a1915671182b86875d60178ddab7ad23fe3f622fbd048fa7d51a744b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F56 5032 bytes
font_01_sfnt_off00007098.bin
bbc2679f14ac8da84e2abeeeac8c1cb456dc3b8d2e5354974144b82b5e5d7cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7098 10408 bytes

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