Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b7a3376ca2dd6f…

MALICIOUS

PDF

53.3 KB Created: 2020-08-14 15:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 357cc2003819ff5e160b31c36dad886b SHA-1: bde8d76c2320ab34b5c69fa3f6856d89bbbecd1e SHA-256: c9b7a3376ca2dd6f8e2d1443df97ba99250ad3cb826c0b5c113807c2e96b0010
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a high number of embedded links, many pointing to Shopify domains, but also includes a critical redirector link to 'ttraff.cc'. This suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL and several other PDF links, reinforcing the attack pattern.

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=free++validity+fingerprint+driver
    • http://luwiripon.tntelitesportsacademy.com/uploads/1/3/1/1/131164048/buwopodedinibomo.pdf
    • http://files.shophillrock.com/uploads/1/3/1/3/131379085/vusovan.pdf
    • http://files.thecramm.com/uploads/1/3/1/4/131453592/732c72.pdf
    • http://xowisapu.uwpprofessorgeorge.com/uploads/1/3/1/4/131453060/515214.pdf
    • http://nuwizokuk.phumelelaproject.org/uploads/1/3/2/6/132682467/kerirobemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/87639468675.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/pikodibobomivumekonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0905/6666/files/pipagex.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0019/files/blank_story_map.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/sunesikimikosasixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/bufilapawekopebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1362/7294/files/dijofuwokerojamexopidap.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/vasafomoze.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/jimuju.pdf
    • https://cdn.shopify.com/s/files/1/0435/9094/2888/files/irs_form_211.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/72995743430.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/downloadani_me_premium_account.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/topographic_map_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/33803826608.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067c4.bin
420e959b56cbb628e597980e85ee9850f3f9dc12a96dec001698538d23afe5ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C4 13184 bytes
font_01_sfnt_off00009249.bin
39e759a2b6348a77e4fa78a05daf868883f763358d2094b7e0369c79d1e4771c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9249 5148 bytes
font_02_sfnt_off0000a3ef.bin
f6966ab8ae0cdfeb4ba6ccdaa2cecd4af9f722199346ee04118eafc16ab79d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3EF 10516 bytes

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