Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f28f157e82f08a…

MALICIOUS

PDF

49.0 KB Created: 2020-08-12 11:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 105073650c1ba066c0606c9832df2dc4 SHA-1: 8fed1b62805a59dc193eb5da92646b21de6c8231 SHA-256: 75f28f157e82f08a6a0478de36e2c4be22b4330244f5ef1a5c3025a2716545db
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to `https://ttraff.com/wb?keyword=generate%20pdf%20c#%20asp.net`, which is flagged as malicious redirector infrastructure. This suggests the document is part of a link farm or SEO spam campaign designed to drive traffic to malicious sites. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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/wb?keyword=generate%20pdf%20c#%20asp.net
    • http://files.jtmcreativedesigns.com/uploads/1/3/1/4/131406537/0359f57b679e1.pdf
    • http://files.yidaistudio.com/uploads/1/3/1/3/131398188/3668810.pdf
    • http://files.sannafineart.com/uploads/1/3/1/4/131482944/805724.pdf
    • http://files.turkanaempowermentproject.org/uploads/1/3/0/7/130738956/vowunakomebuwe_bijiniz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5180/9949/files/99880225008.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/botefig.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/17857332888.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/sebowabebe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/kukudeguwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2093/3528/files/wegipojifugezidupubo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2675/0357/files/jamusekibiberefusetugaris.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/98666579810.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/28907276821.pdf
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/49935167224.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/malawaxofusikunej.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/budget_line_economics.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3361/files/leraniladiwemipi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7143/files/kotor_2_handmaiden_jedi.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_off0000673a.bin
a9af028cb6903668e64214b4880faf71a4a71a1a031d9624d5e7c58c20395473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673A 4600 bytes
font_01_sfnt_off000076e1.bin
79cd9c56414c1a2a0c5fb7152382f95b2dcb51dd6c236b21b4a3ffb0549109b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E1 15108 bytes
font_02_sfnt_off0000a702.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA702 4324 bytes

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