Malicious PDF — malware analysis report

Static analysis result for SHA-256 05080eae1ce83f14…

MALICIOUS

PDF

42.3 KB Created: 2020-08-21 17:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bbe92d5c12ff91b87b87d4e6c396ef5 SHA-1: 8b5fb1d91fbf90bce93d7b6167fae30827ce18a6 SHA-256: 05080eae1ce83f14f079d372d868740936c52b3d2db30d53763260ffdcf55ebf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=simplifying+exponents+expressions+worksheet', suggesting a lure to a malicious site. The presence of multiple Shopify links indicates a link farm strategy to obscure the true malicious destination. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=simplifying+exponents+expressions+worksheet
    • http://files.sperohopellc.com/uploads/1/3/2/7/132712358/47fc9.pdf
    • http://files.flowersbywillows.com/uploads/1/3/2/6/132695472/jegatetekiduvuruj.pdf
    • http://jesad.relaxoverse.com/uploads/1/3/2/8/132816066/01c66c7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/66502682320.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/timupusakotiwofurotibidas.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0862/files/dalaveradenijimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3111/files/35254018578.pdf
    • https://cdn.shopify.com/s/files/1/0449/9108/6750/files/font-_family_css.pdf
    • https://cdn.shopify.com/s/files/1/0437/2224/4264/files/57033622208.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99203043279.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8084/files/renutifujofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/begogafuj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/bambusa_blumeana.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_off00005ace.bin
612d797a5345923f5d367582aa42c6b69cf3b9a8916364763c56961016bccdb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACE 5324 bytes
font_01_sfnt_off00006ccf.bin
a20cc6722e3c4a649782b8f19ffe9e7d6c761ed37cac9d2e223c223bf1fdd60a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCF 9764 bytes
font_02_sfnt_off00008e29.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E29 4324 bytes

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