Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da2eb4309b22782…

MALICIOUS

PDF

38.2 KB Created: 2020-08-29 01:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba0917091fc2a4e64ec98ed0239da1ac SHA-1: 7641190f37c4a20d942bf4b7354e2ecea3b0f49b SHA-256: 9da2eb4309b227822813bd25f657e4534f2b03b5933576d69ac81c8b2257b3f3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=divorce+affidavit+format+pdf'. This URL is presented within the document body, disguised as a divorce affidavit, indicating a social engineering lure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm intended to improve SEO for malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=divorce+affidavit+format+pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/60507431438.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/11900930701.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5480/files/backbenchers_novel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/the_art_of_contemporary_travis_picking.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/howard_schechter_mammoth.pdf
    • https://cdn.shopify.com/s/files/1/0428/9055/9655/files/camille_paglia_libros.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/25729362034.pdf
    • https://static.usrfiles.com/ugd/b8c837_63c0b9f2540f43eb8908bfb08b4540fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_6318aef9c09f4bc9a2495f8a4d4f9321.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3c940acdaa34acc817d1029dd33aeb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dc3a6cc412c4f74a54d1d6571b24b38.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1befd1435fb456193bef9b441353e4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7877b9763f2e40b19743e642d20e898c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e80f3863e9394ff49499568e03ae0785.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058ee.bin
d97859a4101d7969c19221c18f481198c67de0968fb36cf17ebdbbc568f5be79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58EE 5152 bytes
font_01_sfnt_off00006a66.bin
4d2d93091514b6fadd72561207c390b54da597d4d8a7d96995d4b5e98338d67c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A66 9920 bytes

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