Malicious PDF — malware analysis report

Static analysis result for SHA-256 50722312f671cff1…

MALICIOUS

PDF

44.2 KB Created: 2020-08-03 22:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e25baa9cd1e17596df45b0245c225b1b SHA-1: 9c4b338c7e59631513d6322c56df2f16e390d31f SHA-256: 50722312f671cff11d823d615c4f2cd559d03931bf17ba1536d66bc587558a2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=diagnostic+interview+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains text related to 'diagnostic interview pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise malicious redirection. The ML classifier also strongly flagged this PDF as malicious.

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=diagnostic+interview+pdf
    • http://files.theharbourvoice.org/uploads/1/3/1/6/131606720/7489381.pdf
    • http://files.wrenthamsports.com/uploads/1/3/1/4/131453252/mupupal-wopamupulisev-pokibataka.pdf
    • http://files.ucalumniband.org/uploads/1/3/1/4/131411024/f028380ae95016a.pdf
    • http://files.eastgwentreferees.com/uploads/1/3/1/6/131636956/d208a299e6.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7901/files/59863230863.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/check_if_a_string_is_a_number.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/52927403797.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/gitor.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/silokizim.pdf
    • https://cdn.shopify.com/s/files/1/0431/2635/8173/files/13153225389.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0794/files/12438672034.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/bobam.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/libaxufofedogovizuzu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1016/files/lovabusezekibop.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7943/files/vibubudixizapitufenedevan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1300/files/gusudugufojezezel.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ef4.bin
9f163608a97781d8dc82e3d6b9046b952c650b6c4c8ecf753c93602af4d20ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF4 5444 bytes
font_01_sfnt_off000081ab.bin
041f948e93600ab195d525091342ac80ff97f19cc82c64c48ff5b8159a8435e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81AB 10160 bytes

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