Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4fecac88d5a4a4…

MALICIOUS

PDF

59.4 KB Created: 2020-08-10 11:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29f0d8d4a9b4fb5ed8dca42ace9a47d8 SHA-1: 1e6ec32e140b446e62436b4ee97cd4cc6108463e SHA-256: eb4fecac88d5a4a40d2be1f1e5e63032a72504058e289ae67767b0880e32cd85
154 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a search result for a popular software download. This link, 'https://ttraff.cc/pify?keyword=autocad+to+pdf+converter+free+download+for+windows+7', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating a clear intent to redirect the user to malicious infrastructure. The presence of numerous other links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility.

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/pify?keyword=autocad+to+pdf+converter+free+download+for+windows+7
    • http://files.engineeringsportsperformanceandfitness.com/uploads/1/3/2/8/132815872/dejebutodawe.pdf
    • http://files.barkcultureco.com/uploads/1/3/1/0/131070674/bimigawepimok-xerajedudo-wadeliwevek-zixawidorofat.pdf
    • http://files.researchingthewest.com/uploads/1/3/2/8/132814989/212562a5021.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/angina_de_pecho_fisiopatologia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/63233646185.pdf
    • https://cdn.shopify.com/s/files/1/0448/2940/9442/files/psychological_facts_about_human_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/xibedodedilob.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3852/files/sebevurejomuwaxukas.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/45830135713.pdf
    • https://cdn.shopify.com/s/files/1/0428/0709/9558/files/79575823176.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/vodivomerelopokopil.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7402/files/ligegijijiwudaje.pdf
    • https://cdn.shopify.com/s/files/1/0435/1298/7802/files/52330621497.pdf
    • https://cdn.shopify.com/s/files/1/0436/9747/1656/files/kitarowuzakimaxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5205/7244/files/lights_retention_scale.pdf
    • https://cdn.shopify.com/s/files/1/0434/2887/2359/files/fabavujir.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087e5.bin
cd22cf123f4310369502372761c2d806d51ffac0da9c8e715616f41f9b517c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87E5 5368 bytes
font_01_sfnt_off00009a53.bin
5b39e9209f2f5823ace8c91dcdd9d22e48f67d4c3a8bd5da9fa9055417ac3ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A53 2576 bytes
font_02_sfnt_off0000a412.bin
d2df99f519854cc1e30fc395c9e12f6e65777ad1d5d8426ffa5a8cb3112222ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA412 10292 bytes
font_03_sfnt_off0000c793.bin
735e795b4d16529a49140ac7f40a22111760e3f1c48d6bea317f9a0d5f86c05c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 16780 bytes

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