Malicious PDF — malware analysis report

Static analysis result for SHA-256 63991b1670b9a515…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 02:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4791792379a3d268ca776a51a91beda SHA-1: 939796adb11c00da871effd6e0308108672a97b5 SHA-256: 63991b1670b9a515c9136dfb3dd9ee010277024bb5aa4bf83dc3238e37385ec3
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on Shopify and appear to be part of a link farm for SEO manipulation. One critical finding is a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination or deliver a malicious payload. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=difference+between+light+microscope+and+electron+microscopy+pdf
    • http://files.fldancecenter.com/uploads/1/3/0/8/130874201/1f24964ada12.pdf
    • http://files.communitychurchsheppey.com/uploads/1/3/0/8/130874318/49948dc.pdf
    • http://files.buckeyevizslarescue.org/uploads/1/3/0/7/130738806/mosizizidepune.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/21562878326.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8450/files/dilojerobegolam.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/zekak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duliwoledemovaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/aluminium_alloys_series.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/13771435475.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1137/files/general_characters_of_aves.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/rajutisisi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/71820678495.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58585016777.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_off00006b2a.bin
55f7350c8e2d7a6a4f319d9a7218f26589c4a8da6f0599be0036e5648efbadd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2A 5904 bytes
font_01_sfnt_off00007f30.bin
d35e08cae9f920918e3e99c20eb8168625e51237cf5f1b6da3490b8b61b3ab28
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F30 10084 bytes