Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc2e157f17b9346…

MALICIOUS

PDF

42.1 KB Created: 2020-08-13 23:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a59d7a59c954e3de98673671f5b87e8 SHA-1: c4232226e3ea9e791c6b963f29607f795e22a6e5 SHA-256: 1fc2e157f17b934637f4b5bd0af4936f089fba10dae408532df098763acf9423
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is likely the primary malicious component. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign documents.

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=acca+f2+notes+pdf+2017
    • http://files.morethansoulfood.net/uploads/1/3/2/3/132302973/timuf.pdf
    • http://telosomaj.sdarmuk.org/uploads/1/3/0/8/130813528/vutoniz-mevapiliruv-xaralajibulig-zujolu.pdf
    • http://files.waiheelimu.org/uploads/1/3/1/6/131607174/nomuvawezilamaranu.pdf
    • http://files.indestructiblekeychain.com/uploads/1/3/0/7/130738779/xulevomufigosumeb.pdf
    • http://dewata.cottageforrentontario.ca/uploads/1/3/2/7/132710703/miribobezuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8388/1893/files/8147013883.pdf
    • https://cdn.shopify.com/s/files/1/0437/2286/6842/files/associativismo_agricola_em_moambique.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3639/files/traducir_archivo_en_ingles_a_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/snow_plow_contract_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/8096/4510/files/30428542172.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/malerofefamizekigo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8216/files/o_universo_autoconsciente_amit_goswami.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/legep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4231/6186/files/tepufugow.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/razoxusitafibumed.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3475/files/rukofewuvesiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7249/files/kezos.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/xugefuwol.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_off00006503.bin
274e30d44d001b2c0fd6fa39d81e51182530fba45586c10d15fb2601a796bc3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6503 5416 bytes
font_01_sfnt_off0000778c.bin
f0ca728ec5a2c0588e6426af41b8eb0f2360411f7acdaf9d2cb75551f6115995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778C 10472 bytes

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