Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3853962c91e72d9…

MALICIOUS

PDF

48.3 KB Created: 2020-08-26 01:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f57e790857d1c28de3b606bbe94c302a SHA-1: 91c235b22a6d3fbe0fc430f12faca799ec63a865 SHA-256: d3853962c91e72d9c84e6dba975b07a508797f037670f61a415a50fb176a0b34
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with a critical heuristic firing on a known malicious redirector. The primary malicious URL is https://ttraff.ru/pify?keyword=flowers+in+the+attic+book+3, which is likely used to funnel users to further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector are sufficient indicators of malicious intent.

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=flowers+in+the+attic+book+3
    • http://votivu.australian-spirit.com/uploads/1/3/2/6/132680835/2dfadd8dfe30.pdf
    • http://files.almamusicandartsfest.org/uploads/1/3/2/8/132815054/290517c66766600.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0436/5352/9753/files/16263796873.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/lonafofusepufenemowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/favosepopugeneretenot.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2026/files/72057124046.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3799/files/65021861628.pdf
    • https://cdn.shopify.com/s/files/1/0461/7702/6201/files/mixafefivafumaketuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/9713/7056/files/36961649481.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/vanuvidazofosokuvovawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/micro_center_richardson.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/november_2020_calendar_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/7836/6872/files/92598027162.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/calvinism_versus_arminianism.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1323/files/xinudovapexupirugi.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_off00007d3c.bin
72d48c6f7c620be050a4ef099e1f1f8d64a4f95cf881937e8bbaae86331ec2d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3C 5304 bytes
font_01_sfnt_off00008f54.bin
b2ca7ebf9b57e3f3462add9c88e20c7b704c3be1808a75789338fba8080c2087
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F54 10668 bytes