Malicious PDF — malware analysis report

Static analysis result for SHA-256 635fa6590f6fb629…

MALICIOUS

PDF

41.2 KB Created: 2020-08-30 10:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d600096c78e125db7ed2fe455b2e756 SHA-1: 180ad2bc26a52bbc0922682cb5ba467a5488feec SHA-256: 635fa6590f6fb6291a5a00e7eb8a908f492997ad7743d9940dd4c57bc6a96de6
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominent URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments that appear to be a lure related to 'New balance mt610'. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious content. The ML classifier strongly indicated maliciousness.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/wix?keyword=new+balance+mt610
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/free_template_for_online_recruitment_system.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/biosynthesis_of_purine_nucleotides.pdf
    • https://cdn.shopify.com/s/files/1/0428/6133/0591/files/98980244841.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/mofuwivorufu.pdf
    • https://static.usrfiles.com/ugd/8de238_a2966ca2b70742eaac411a7c3365bc41.pdf
    • https://static.usrfiles.com/ugd/760101_d8655100e51c47bbb728ce2e6dd6688b.pdf
    • https://static.usrfiles.com/ugd/b8c837_65823cc4e8fc42bdb755d0bc994de157.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdc485f64a9e4057b15f325d968dca48.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a03a42d08d2456c818c1df141d2c68a.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/73182680555.pdf
    • https://cdn.shopify.com/s/files/1/0433/3987/4462/files/shure_srh_440.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/d_d_4e_character_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/71439253098.pdf
    • https://cdn.shopify.com/s/files/1/0438/2025/3344/files/xuxetidogawolo.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_off00005feb.bin
d73ce7a09e4f687c5d363c11fcebdfff7379e21411a05e7a2aa7178170167e11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEB 5220 bytes
font_01_sfnt_off000071b6.bin
a27c377b5467f01286ccf4e9fd1939c5422009fad199a1a83d5e578c928567ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B6 11324 bytes

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