Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3c91c213f270c9…

MALICIOUS

PDF

43.7 KB Created: 2020-08-12 18:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd7c5039df8210eedeb03b803f1da14 SHA-1: 6631702f91f74442b6db1fbf8abdf4cf8dd799f4 SHA-256: 3c3c91c213f270c9064327ee9ea936011b79750f737deb2e2b0aa3c360fda06e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to lure users to click on a redirector URL. The primary malicious link, https://ttraff.ru/pify?keyword=safe+scrum+master+certification+questions+and+answers+pdf, is a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other links to PDF files hosted on Shopify, likely as part of an SEO poisoning or link farm tactic to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=safe+scrum+master+certification+questions+and+answers+pdf
    • http://files.upstairsartgallery.net/uploads/1/3/2/6/132695478/2712998.pdf
    • http://tomiwig.opalaneboutique.com/uploads/1/3/0/8/130873822/gamivunu-nuguvanisid.pdf
    • http://files.act-cism.org.au/uploads/1/3/1/4/131438056/luvafe.pdf
    • http://files.samedayresume.com/uploads/1/3/0/7/130776413/cf4c3dce1b1.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/73652911500.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1721/files/81427742281.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/wodiduwonog.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5813/files/bathroom_design_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/5975/6708/files/michelle_beatles_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6806/files/paripot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7206/files/dobufifilezuruki.pdf
    • https://cdn.shopify.com/s/files/1/0431/5709/4559/files/22398178567.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/factorio_4_belt_balancer.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/fakonixonegub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0074/files/agreement_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/coran_bilingue_arabe_franais.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_off0000691d.bin
4e42d0efffe72ab80c8d0e06ade2342349cec8f09f447a91b062a36d8b08cf1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691D 5592 bytes
font_01_sfnt_off00007c12.bin
27be9210ee26e7f1606cf3afd8cb44f19df4778cc698d0e9e713511c721fc2b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C12 10808 bytes

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