Malicious PDF — malware analysis report

Static analysis result for SHA-256 042a938db0116022…

MALICIOUS

PDF

54.0 KB Created: 2020-08-10 14:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f32c90d85423d6dc823f2782aaabfa0 SHA-1: c970767dcb71c3e0fb109528d77cb83b25e12706 SHA-256: 042a938db0116022730611ad712900bac1e9e450e6ad5175c68e564292011720
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=animal+ecology+notes+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links pointing to what appears to be a link farm designed to host numerous PDF files. This suggests a phishing or spam campaign aiming to drive traffic to malicious sites.

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=animal+ecology+notes+pdf
    • http://tafuwukow.spokanetreesservices.com/uploads/1/3/0/7/130776445/papukenusipigegupe.pdf
    • http://files.frederick-biebesheimer3.com/uploads/1/3/2/3/132303320/1736729.pdf
    • http://files.pathspersonalfinance.com/uploads/1/3/1/3/131398195/vixufera-zuralufilis-daranivekiruvin-popudovuvenitot.pdf
    • http://files.fordsauto.net/uploads/1/3/1/8/131856851/3136186.pdf
    • http://files.eagleslearningathome.com/uploads/1/3/1/4/131407445/vojufu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/sidibabujepanowem.pdf
    • https://cdn.shopify.com/s/files/1/0443/3421/9420/files/aoac_test_methods.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5398/files/97789658615.pdf
    • https://cdn.shopify.com/s/files/1/0433/5704/4890/files/xetozo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/vegibavorisigezox.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4833/files/twitch_vip_badge.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7541/files/maganujosopumutan.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3133/files/wixuvun.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/dekumuvekiwom.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9381/files/duzetodutovanexekeloduki.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/40708645918.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5675/files/40187236989.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_off00009487.bin
7f2a36aa557609a57024f943b5c38eded58b7d70f0dd70c4812f55e3ca7e070f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9487 5472 bytes
font_01_sfnt_off0000a70e.bin
0ff7235d7b38c14d3afd7cc4c3ccd6c970ec67f500532e8fb497545d6d613dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA70E 10564 bytes

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