Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd72042dc45c705…

MALICIOUS

PDF

47.5 KB Created: 2020-08-14 23:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 878ff791090bb94e3856f53a6c6939fc SHA-1: d605b3b5fc5e27129ac96e10bd179cb1f7be2212 SHA-256: 0cd72042dc45c705cced847933ae9880ab3f083f7dc600dba48ada8bb22cbc8b
194 Risk Score

Malware Insights

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

This PDF document contains numerous links, including a malicious redirector to ttraffic.com, and links to a large number of other PDFs hosted on Shopify. The document body, though heavily obfuscated, contains references to 'Fitbit charge 3 operating manual' and the wkhtmltopdf tool, suggesting a lure to trick users into visiting potentially malicious or SEO-farmed content. The presence of embedded URLs and the ML classifier's high confidence further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=fitbit+charge+3+operating+manual
    • http://files.alliancetoheal.com/uploads/1/3/1/6/131607269/takugosubuvok_rizekifufumuzed.pdf
    • http://tujarixe.snowangelsiberians.com/uploads/1/3/0/7/130776447/6959540.pdf
    • http://files.gatewaycathedral.com/uploads/1/3/1/4/131453214/diloroxiwefudadav.pdf
    • http://kubafev.brucereevesswiftamericasartist.com/uploads/1/3/2/7/132741029/1099581.pdf
    • http://zenuwaf.gilfordfreepresbyterianchurch.org/uploads/1/3/1/4/131409090/vazesilibi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/navanagobamuxageda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16994954809.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/57709791000.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/sekiro_prayer_necklace.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/narijir.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6774/files/media_query_css.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/lenojuxujupuwomajumumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2155/0247/files/28928867788.pdf
    • https://cdn.shopify.com/s/files/1/0436/2525/0974/files/10743746720.pdf
    • https://cdn.shopify.com/s/files/1/0432/6896/4505/files/cbse_8th_class_maths_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/74532576351.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_off00006eee.bin
415b1acc913e059a2c86295c48fc00bf298af2f504e915a56676798b90282450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEE 5308 bytes
font_01_sfnt_off000080ce.bin
0b01dab83f35359c246291e69b9bce5b367109595b8b1d39d632e50c60af40b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80CE 10024 bytes
font_02_sfnt_off0000a31b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA31B 4324 bytes

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