Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a74d31bb5f7bcc…

MALICIOUS

PDF

62.5 KB Created: 2020-11-09 14:06:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a7041044f50d9fb27bcacd29eef37a1e SHA-1: 93d3a8689ae526ab8ae61ec349cc7144db12edf3 SHA-256: 77a74d31bb5f7bcc4153dffe27ef4b1d7cf181946d2c388a7525e160e60afe70
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the URLs, suggesting an attempt to direct users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/123?keyword=dominion+power+monopoly In PDF document text
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/lurazivupulezazaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_5fa2e981a4d77.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/tewobete.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/divejuxofepuwori.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/6973011.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/515431.pdfIn PDF document text
    • https://rodamopuxex.weebly.com/uploads/1/3/4/3/134354351/gopomore_mowomuxalun_nevuti_toxowidomorug.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/nekajo-depan-sizamiwat-judaxijotupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_5f98e8e0b92fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nopomewegobij/42057309248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a32da5-33f0-41ba-abc2-f0d7775b2e40/milady_chapter_25_manicuring_test_an.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/gajukifagenubirika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a570a431-55c1-47ad-8126-5b67adb333f0/19557072131.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/wayne_state_university_transcripts_address.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/pasta_boat_manual.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA762 4476 bytes
SHA-256: f1bfd117e55e8985065102be2b9ba1ae0c9e9e85a05ca781e14217eb1023c461
font_01_sfnt_off0000b67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67C 11904 bytes
SHA-256: 120e13c348118c8e779cd656759dac8010993b9af50aea591108208eefbf2baa
font_02_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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