Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01f009afba8d4b7…

MALICIOUS

PDF

47.1 KB Created: 2020-09-07 00:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa757eac3d422aeaa734dbb12bf0fd53 SHA-1: f60f29da3858058d21d5de063bf4b83216043761 SHA-256: f01f009afba8d4b7cc9c42bdac2e884849449b9df0d685caacc3a8b5b7c5fcd9
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure, specifically 'ttraff.club', which is likely used to obscure the true destination of the attack. Another heuristic indicates a large 'link farm' within the PDF, with many links pointing to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute content through a seemingly legitimate platform. The presence of these link farms and redirectors strongly suggests a phishing or malware distribution campaign.

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.club/wix?keyword=byomkesh+bakshi+tv+series
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/dojomokego.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1341/files/jodirotuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2837/files/27630587439.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/zafujenogisivi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/calendario_agricultura_biodinmico_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/99_smithing_guide_osrs_2019.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/6997/files/partnership_agreement_form_california.pdf
    • https://cdn.shopify.com/s/files/1/0436/5775/6825/files/bharatha_rajyangam.pdf
    • https://static.usrfiles.com/ugd/97368a_21d8ebcd854e470fa5c8cc0e0d72f140.pdf
    • https://static.usrfiles.com/ugd/2813e2_b1d98cd42c514309b2a98c399c85e731.pdf
    • https://static.usrfiles.com/ugd/865d50_b71ba863c61341088caed66019b9a06d.pdf
    • https://static.usrfiles.com/ugd/3254bf_ccd69ff4d3254f24885537bc095c43fc.pdf
    • https://static.usrfiles.com/ugd/4cf28d_18dc8bdbc6e14b8db0ae12ecbd9cdb4e.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/34018254373.pdf
    • https://cdn.shopify.com/s/files/1/0435/3789/1482/files/convert_open_office_to.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/bootstrap_vue_datepicker_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3918/files/50038451571.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/bardock_se_transforma_en_ssj_blue.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_off0000712b.bin
9496ccfd4bc2b2ee9cca7766148cb57661f64e0e4500260b7f3701e8ccca507a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712B 5308 bytes
font_01_sfnt_off0000831d.bin
cd54a8cf16c884f7a9874b29c7b75fd99ea3afef50b76150c61db16c5d856383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x831D 14156 bytes

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