Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff8a4aba67170d1…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 10:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90274a6cc29303b8832b18262a3f337d SHA-1: 8bb3446eacb90ef05faced4892b6cd12454e082e SHA-256: 6ff8a4aba67170d1bc5aed310ce0bad7941a23a77ca21e3988ece55ba389d826
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO poisoning attempt. One of the primary links, 'https://ttraff.ru/pify?keyword=annales+chimie+terminale+s+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links and the redirector suggest an attempt to drive traffic to malicious or unwanted content.

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.ru/pify?keyword=annales+chimie+terminale+s+pdf
    • http://nininej.coolmetoday.com/uploads/1/3/1/0/131070356/930033.pdf
    • http://ruzelobod.kalonstudio.com/uploads/1/3/1/4/131407057/20a2774091.pdf
    • http://files.newartistfair.com/uploads/1/3/0/7/130776245/8647245.pdf
    • http://files.westvlietstreet.org/uploads/1/3/0/8/130873921/melijutumijiji-wemikewu-dewepoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/9333/1873/files/assault_rifle_build_division_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6351/7092/files/bofogimuno.pdf
    • https://cdn.shopify.com/s/files/1/0437/6697/2577/files/flawless_remix_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0437/5019/5354/files/speed_control_of_ac_induction_motor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/fovum.pdf
    • https://cdn.shopify.com/s/files/1/0428/6660/6247/files/wajosedofasewevefoxaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/exercicios_para_aprender_a_tocar_violao.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/28922582891.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/19727972460.pdf
    • https://cdn.shopify.com/s/files/1/0440/8344/5925/files/traer_preterite_conjugation.pdf
    • https://cdn.shopify.com/s/files/1/0430/7740/2778/files/jimefule.pdf
    • 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_off0000674d.bin
9daa87f2ee23fe30b133089e6a4f48bb8b69c8cfdb9524c89b0c937fa3332cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674D 5384 bytes
font_01_sfnt_off00007964.bin
88dd65babccf330e89796bb384ad4102dd35010d28f0c41bd0be7b5224cc83b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7964 12040 bytes

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