Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2cdd3614d311a2…

MALICIOUS

PDF

44.8 KB Created: 2020-08-05 11:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf3c888d729c0ff796a09224b1eb298 SHA-1: 211021fae0354d0f5ad8b21b0f8f5eb6d612f508 SHA-256: fa2cdd3614d311a29e2ae4738b8decff896c94e93a25b47727920b925a4a8a74
152 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 malicious redirectors, specifically identified by the heuristic PDF_SEO_LINK_FARM. The primary malicious URL, https://ttraff.com/pify?keyword=elternb%25C3%25BCrgschaft+mietvertrag+pdf, is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to legal documents like 'mietvertrag pdf', suggesting a social engineering pretext. 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.com/pify?keyword=elternb%25C3%25BCrgschaft+mietvertrag+pdf
    • http://mulujag.anglersadvantage.ca/uploads/1/3/1/4/131437886/libonol_lesexaluvawuti_gixipulidefegux.pdf
    • http://files.alottawalkin.com/uploads/1/3/1/4/131452988/3013735.pdf
    • http://files.cleanbeehomeservices.com/uploads/1/3/0/9/130968921/6362791.pdf
    • http://files.dbtfamilyskills.com/uploads/1/3/2/3/132303035/4098417.pdf
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/fewolegom.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/60561333513.pdf
    • https://cdn.shopify.com/s/files/1/0435/3448/3616/files/kagafoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/6372/0613/files/28582019475.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/93916998241.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4552/files/xixilekutezidozuli.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/58553061800.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/93815882307.pdf
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/american_english_file_3_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/65206719419.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/24675579995.pdf
    • https://cdn.shopify.com/s/files/1/0439/1793/4747/files/nimufijixewexal.pdf
    • https://cdn.shopify.com/s/files/1/0440/5529/8213/files/3072419762.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/
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/65206719419.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d42.bin
91d911bd8c91d455c728a90de9f4514d7f47b2695b444e9a5c71446602344146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D42 5848 bytes
font_01_sfnt_off000080d5.bin
74addf4261964f7c91be0dcd47b9ca078aeae9892175aa1f1644e53ddf599745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D5 10736 bytes

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