Malicious PDF — malware analysis report

Static analysis result for SHA-256 637367cc830d6370…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 14:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5213d06d0db17b95bcd8cd3561bcd2a5 SHA-1: 0b4b0616ed92ce1fa7b20e456ce8776f7dff1cf4 SHA-256: 637367cc830d6370d12436dc42f8ea15a4ce4ce95971a6f2bdd8c7f65c2a99c1
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking keyword, suggesting a lure for SEO manipulation or phishing. The ML classifier also flagged this PDF as malicious with high confidence.

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/wix?keyword=azure+devops+cli
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/9343326206.pdf
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/data_and_computer_communications_wil.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/78197149931.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/jetewinekekejunujaxogi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8022/7747/files/21036309227.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/tominolenuvekegifar.pdf
    • https://cdn.shopify.com/s/files/1/0430/3178/9721/files/campanas_en_la_noche_letra.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/bayou_classic_cooker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3005/2005/files/14465508116.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/pukesikifikol.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/wilelofesakalujimotovi.pdf
    • https://static.usrfiles.com/ugd/a01749_6da0bd71922b4f7480cb12950847aba6.pdf
    • https://static.usrfiles.com/ugd/4dd980_ce89028487094692aaee5c10b8bfce56.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006151.bin
ada2a212d1ee8f6bbd1e20c7fbefa112471e14410ce41550b0d09b1c8cfb6c29
pdf-font-stream PDF embedded font (sfnt) at offset 0x6151 4652 bytes
font_01_sfnt_off00007134.bin
f653cb06822668a8eaae5dad35b92d9fea6db774e6a6c3e6d3460116bfaea486
pdf-font-stream PDF embedded font (sfnt) at offset 0x7134 10588 bytes
font_02_sfnt_off0000957a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x957A 4324 bytes