Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3521e6c44b6d5e…

MALICIOUS

PDF

43.5 KB Created: 2020-08-02 11:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d216db782d896c988bbc5bb8f5f04c85 SHA-1: b1696ca42e9ac8d0d8081c08e2055bf86313d812 SHA-256: 4a3521e6c44b6d5e1f74193c843721b7e97d48fb764709cf55a5116a6b62eed1
152 Risk Score

Malware Insights

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

The PDF 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, ttraff.com, which likely serves as a distribution point for further malicious content. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic to distribute malware.

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=python+fit+gaussian
    • http://files.cvscpa.org/uploads/1/3/1/8/131856161/594d8bd8d25ca57.pdf
    • http://files.justawesomesauce.ca/uploads/1/3/0/8/130874514/mozewopa.pdf
    • http://files.carlysullensphotography.com/uploads/1/3/2/3/132303013/3981196.pdf
    • http://files.ufcooperatingteacherssupport.com/uploads/1/3/0/8/130874240/gopedoriwati_xabed_lutijom.pdf
    • http://files.microcontractor.org/uploads/1/3/0/9/130969690/petimulamebofiruxiwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/bloodshot_stronghold_puzzle.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0999/files/95201809435.pdf
    • https://cdn.shopify.com/s/files/1/0440/5864/0534/files/lotirarewaweluno.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/cards_against_equestria.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/958587404.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/divizaximogakobaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3361/files/wipilarip.pdf
    • https://cdn.shopify.com/s/files/1/0434/8605/2518/files/6282720812.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/refolukipokogogegepapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/xogunuvibigabo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/mewomazorixoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/6307/4213/files/neguduvezadedibubivugaxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4102/files/wolagaro.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_off00006697.bin
c61315e6b3701118835ebcf8c18884a2de9e70d206c2eaacfe3a41bed537d10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6697 5004 bytes
font_01_sfnt_off000077b4.bin
219075dc927010d8f237288966bdcd0846eadf4254657f6da58b1c6f08e235e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B4 12876 bytes

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