Malicious PDF — malware analysis report

Static analysis result for SHA-256 72792e02fe127a73…

MALICIOUS

PDF

41.0 KB Created: 2020-08-22 00:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09df16dd2a0a0a15d26ace2c93c36a68 SHA-1: ccd5ba02b489f271d31edc5dcf01f48377c80e35 SHA-256: 72792e02fe127a7387c1b9030d1fdc6a1f6c4e11e6b9fca06b93b35bcc782e11
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link pointing to 'ttraff.com', which is flagged as malicious. It also hosts a large number of external PDF links, many of which are benign Shopify URLs, suggesting a link farm or SEO abuse tactic. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious redirector and the lure of 'Purevpn openvpn files' suggest an attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=purevpn+openvpn+files
    • http://files.educationalroboticsreview.com/uploads/1/3/1/4/131407424/6271964.pdf
    • http://files.kmmcfarland.com/uploads/1/3/0/7/130739719/kezubededadefuwid.pdf
    • http://files.rockyridgefarm.org/uploads/1/3/1/3/131378993/zumixokag_zomezakosomimet.pdf
    • http://kewojewo.soscarsoncity.org/uploads/1/3/1/4/131454207/jolov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/1519/8104/files/magepurulema.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/soxenebipevigitatomapow.pdf
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/zunowow.pdf
    • https://cdn.shopify.com/s/files/1/0462/6769/5255/files/zajabukuwasuko.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9430/files/25511973619.pdf
    • https://cdn.shopify.com/s/files/1/0430/2739/8807/files/aircraft_structures_for_engineering_students_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/dudonuvivejoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1956/6231/files/wozofusaniziv.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2651/files/61023896271.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5072/files/tetuvek.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7546/files/rbi_banking_regulation_act_1949.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6343/files/autograph_kannada_film_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/36921202359.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7820/files/xudodufa.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_off00006481.bin
90eae58744f543988f6474c87821064063bcd77f2c19fa87608904102a5b28b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6481 4748 bytes
font_01_sfnt_off000074b8.bin
93c486c7cdf0ed376ab974c663d390221f82a6128a6993e1c704f4cf4c6da1a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 10060 bytes

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