Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ceec4b3016cb74f…

MALICIOUS

PDF

51.0 KB Created: 2020-08-22 05:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6f77c188ea48d9805186a52e2783eb8 SHA-1: 5473e1128620b2282fad0583f68ff5922195654a SHA-256: 7ceec4b3016cb74f79d3db8584cf1896912c58b7bffbf2cbe1fdb091b29abd7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to direct users to harmful content.

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=action+sheet+ionic+1
    • http://vaxajun.trulymedium.com/uploads/1/3/2/3/132302921/7325384.pdf
    • http://files.becican.com/uploads/1/3/1/0/131070212/tadoliluvibu_tovefomiral_tikeladodi.pdf
    • http://files.chillnbeans.com/uploads/1/3/1/1/131164152/tirowujuja.pdf
    • http://kogowuxo.oliviacliftonbligh.com/uploads/1/3/2/8/132814930/satenojov-sofigo-rivavu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/10342239276.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/leg_strengthening_exercises_for_seniors.pdf
    • https://cdn.shopify.com/s/files/1/0438/8565/8280/files/11975026822.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/schopenhauer_world_as_will_and_idea.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3695/files/34580670407.pdf
    • https://cdn.shopify.com/s/files/1/0451/8101/0071/files/conduction_convection_radiation_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/puxajulefinevudu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7170/0120/files/pikogakenawiverifinunim.pdf
    • https://cdn.shopify.com/s/files/1/0439/7305/0526/files/cancionero_guitarra_argentina.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94215193789.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6777/files/71648937336.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/marriott_friends_and_family_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0796/files/85377265027.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007124.bin
739462b287782b590d733218bb3972a0d196b7c47b2776d20298e06123818022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7124 4380 bytes
font_01_sfnt_off00007ff6.bin
929c09f0f63c89623bbe0a26378d9a26fd6d49e688fbbbe440d71241d7c6c5c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF6 15640 bytes
font_02_sfnt_off0000b119.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 4324 bytes

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