Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d9bbb9e3ed87d9…

MALICIOUS

PDF

42.9 KB Created: 2020-08-05 18:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7c215a4e7b3f87a85ab1694cb42dc43 SHA-1: 44ac8a51b0614eeed5a66945ee0cc3c0de4824f2 SHA-256: 91d9bbb9e3ed87d96b8512db12acab893939c9e8074fe830be31dec290022ac3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to funnel users to malicious sites. The document body, though obfuscated, contains the same URL and references a manual, suggesting a lure. The PDF also hosts a large number of links to other PDFs on Shopify domains, indicating a link farm possibly for SEO manipulation or to obscure the true malicious destination. No scripts were extracted from this sample.

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/wb?keyword=cizalla%20manual%20para%20chapa
    • http://files.burmantoftscommunityprojects.org/uploads/1/3/2/7/132710756/pasulixox_nutodomid.pdf
    • http://files.mariakiekari.com/uploads/1/3/1/3/131398221/geveniwaf.pdf
    • http://files.sharibatheactor.com/uploads/1/3/1/6/131636907/965d67f75918.pdf
    • http://files.platinumeventsbayarea.com/uploads/1/3/2/8/132815872/wewonivoxeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/2041/7181/files/crownline_boat_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0432/9927/4916/files/20418404966.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/11194149853.pdf
    • https://cdn.shopify.com/s/files/1/0435/4958/9668/files/13857584832.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/vowetokedowurubeviveduk.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/57354668403.pdf
    • https://cdn.shopify.com/s/files/1/0437/6693/9799/files/55147208883.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/jebapo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/33659159225.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/78055044041.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/73112587736.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/94917201861.pdf
    • https://cdn.shopify.com/s/files/1/0433/0379/6894/files/bipurifujafi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8530/6782/files/miresesupizugow.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_off00006453.bin
75b5b12b05b5ec5ede4a845f7886051182da65306b22d2bd8da0b0aef2f3b7d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6453 4948 bytes
font_01_sfnt_off000074fd.bin
1c74d78a920c3a06009d0485a296d7663b266b2f96d131201dca5e70db044de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FD 12432 bytes

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