Malicious PDF — malware analysis report

Static analysis result for SHA-256 df73e65c2ac22ab6…

MALICIOUS

PDF

42.7 KB Created: 2020-08-08 17:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1785da3da09b5687a5cda9ca2ddba69d SHA-1: b024383221dd0a208fa0705f8a073e77522fdf9e SHA-256: df73e65c2ac22ab6857ac0db79e1a575edeef0c99e10885d8fc5fd00251eba2c
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=html+tags+examples+pdf`. Additionally, it contains a large farm of external PDF links, many hosted on Shopify domains, suggesting an attempt to manipulate search engine results or distribute content through a large number of URLs. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector link is a high-confidence indicator 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.com/pify?keyword=html+tags+examples+pdf
    • http://gejuduwug.michelleconsidine.com/uploads/1/3/1/6/131606186/jefubusofise.pdf
    • http://files.vasileiosbourmpounis.com/uploads/1/3/0/9/130969399/vugunesumod.pdf
    • http://nedonem.jamesfamilypage.com/uploads/1/3/1/4/131453133/f3710d2.pdf
    • http://files.paigeandmichaelb.com/uploads/1/3/1/4/131437005/6289540.pdf
    • http://files.kathleenbrownpsychicmedium.com/uploads/1/3/0/7/130775950/dinetepoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7834/4085/files/38793975592.pdf
    • https://cdn.shopify.com/s/files/1/0436/9039/3755/files/can_i_really_trust_the_bible_barry_cooper.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5277/files/diablo_2_bowazon_build.pdf
    • https://cdn.shopify.com/s/files/1/0434/0691/7799/files/tupaxejoxelifixotidupo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/puropo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3284/5207/files/72487738334.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/jadiwiweseviwuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1979/files/analise_de_dados_quantitativos.pdf
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/suburban_rv_furnace_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2155/7150/files/79609535082.pdf
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/plant_pathology_laboratory_equipments_and_their_uses.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3085/files/5248798566.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_off000063ec.bin
21bd5d2b38737b9cfd93eda8f24d86992134b56d56afd762b74d20a314f0eb3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EC 5292 bytes
font_01_sfnt_off000075e7.bin
967f5ce6fc192684b967b4bc9f0ec304443698356695597b0f9376a511ac89d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E7 12416 bytes

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