Malicious PDF — malware analysis report

Static analysis result for SHA-256 779fc3e924030d82…

MALICIOUS

PDF

50.0 KB Created: 2020-11-05 11:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9dc59b83c57a7aabba6f17b4f18d5490 SHA-1: 1e05b75854e85c88844a859f329b9f057593f52c SHA-256: 779fc3e924030d8267ca8f91171d448aded4e1386e5dcbc533e1e3da57b0268b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to SEO-optimized PDF documents hosted on various cloud storage services. One of these links, 'https://ttraff.link/123?keyword=t+trimpe+2002+chemistry+answers', is identified as a known malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded links and the ML classifier's high confidence indicate malicious intent.

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://ttraff.link/123?keyword=t+trimpe+2002+chemistry+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5f949a11671c0.pdfIn PDF document text
    • https://vorarixumo.weebly.com/uploads/1/3/4/4/134490966/wojorekojo-raxuk-nakufiwubeguli-tuxinogebifa.pdfIn PDF document text
    • https://lujisitezolip.weebly.com/uploads/1/3/4/1/134109273/8376067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f88c1afbb127.pdfIn PDF document text
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/pabebiwukogejafituw.pdfIn PDF document text
    • https://lenimupet.weebly.com/uploads/1/3/4/0/134013040/xiposowopej_wuwajikazodo_pitepuvunefuf_telupepifo.pdfIn PDF document text
    • https://metumarexidema.weebly.com/uploads/1/3/4/5/134591821/ab24d237b8.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/mokuwanibof/graco_baby_cribs_at_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/symbols_in_the_things_they_carried_short_story.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/equilid_200_mg_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/protandim_peer_reviewed_studies.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/40k_ork_codex_8th.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/50962287031.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/why_government_icivics_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/carnival_of_venice_trombone_solo.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/sodium_phenylacetate_uses.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_off0000796e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796E 5236 bytes
SHA-256: c22b60a3f67dfc7284bda204065ddeb8f37cc1b58c23fcda8de0d40799929a88
font_01_sfnt_off00008b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B17 9944 bytes
SHA-256: 0f6be6e5c777f3d63e59d76c458864e388636a61a73df577eb85df57b041beb4
font_02_sfnt_off0000acf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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