Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb25d173fd6d248…

MALICIOUS

PDF

44.0 KB Created: 2020-08-12 13:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14edc609097fbefbd8cbc0bd2b606307 SHA-1: 867234d7b8b7565a6ca3a317351802970e2bc8d1 SHA-256: 7fb25d173fd6d2480941e8d7b6e81e9fb6ccfb1727303166018c56a17287e88d
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=lbs+to+kg+chart+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=lbs+to+kg+chart+pdf
    • http://files.villadesbambous.com/uploads/1/3/1/3/131379622/7807861.pdf
    • http://files.skintwalletsusa.com/uploads/1/3/0/9/130970009/4881129.pdf
    • http://files.jmsdvs.net/uploads/1/3/1/3/131398362/zokoruwularozabefu.pdf
    • https://cdn.shopify.com/s/files/1/0448/0489/8978/files/components_of_health_related_fitness.pdf
    • https://cdn.shopify.com/s/files/1/0431/3956/3686/files/zabobej.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/65495928437.pdf
    • https://cdn.shopify.com/s/files/1/0441/3915/1512/files/jomuzowifegagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0037/files/56564481018.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/43157314627.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8136/files/zubixigafewomojimezuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/6735/7846/files/mupisavegumas.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/xonizudipagovelafe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9345/1159/files/medical_laboratory_safety_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8545/3730/files/aprender_a_tocar_acordeon_de_botones.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/bsa_medical_forms_abc.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7672/files/17417741134.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_off0000645a.bin
30ff7293aeca043e4ffa06a2f55dc138fdc3ae6d1d2d91e2d46bbea9cbc1e2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645A 5528 bytes
font_01_sfnt_off0000771a.bin
aa973b62f6d71352ae2c92d3fba8dc5f5a311f064e2dfddf22aeb692b8aafd5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771A 13808 bytes

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