Malicious PDF — malware analysis report

Static analysis result for SHA-256 6adbc9f614587682…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 15:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76810fb047ad2cc1632735c0d5adc498 SHA-1: 63c3e38ed52b5bd0458015f9fd0e161b4d0de5e7 SHA-256: 6adbc9f6145876822e8b0b4ecc6d261cf5979d7a6b4622dd1188da104fd5f0ed
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO poisoning attack designed to funnel users to malicious content. The ML classifier strongly supports the malicious verdict.

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.com/pify?keyword=adjectives+with+three+forms
    • http://xedexijov.hopeforpuertorico.com/uploads/1/3/0/7/130739553/zatatifobaxamufadilo.pdf
    • http://wumefixew.addyevenson.com/uploads/1/3/0/7/130740522/xogirexape.pdf
    • http://files.emilyeatkinson.net/uploads/1/3/1/4/131438003/4133482.pdf
    • http://dafew.fibrosisinstitute.com/uploads/1/3/1/6/131606183/82f95.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8461/1733/files/wakex.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/51898105986.pdf
    • https://cdn.shopify.com/s/files/1/0435/5571/7271/files/beauty_and_the_beast_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/semegoketonekenebew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/lojivalenuwunukazijiro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87678197609.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/lofijejobekawanubasezas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5567/files/luwugon.pdf
    • https://cdn.shopify.com/s/files/1/0438/1288/0544/files/worekiwifoxupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/8745712313.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/woxubetedopiruzibefinoke.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_off00005da0.bin
21751df3d21dbd8ab607c9152b3cc002da0976afd39a33ed15afcd497ff59c75
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA0 5236 bytes
font_01_sfnt_off00006f64.bin
5477b084efb52f13d8c4df081d798ec2f86324fdc8e99c31306086f26150ab49
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F64 12964 bytes