Malicious PDF — malware analysis report

Static analysis result for SHA-256 456701d3a43bbc66…

MALICIOUS

PDF

44.1 KB Created: 2020-08-06 17:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 083993e7bf4f4af4784ef2744964247d SHA-1: 016812bdee2d43971808fa6661889d22943891b7 SHA-256: 456701d3a43bbc6686d1ca8e0e6cb50d0663ce693bf3459fb3049810e72ac09a
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 lead to a redirector service (ttraff.cc). This suggests a link farm or redirection attack designed to obscure the ultimate destination of the malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

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=calaveritas+literarias+ejemplos+pdf
    • http://files.niaimani.net/uploads/1/3/2/7/132741194/f4f62.pdf
    • http://josaxupu.johnregan.org/uploads/1/3/0/7/130739564/ccf0e46.pdf
    • http://files.carolinebowditch.com/uploads/1/3/1/3/131381204/biluw-xowoxizix-zanobufenulote.pdf
    • https://cdn.shopify.com/s/files/1/0443/3536/6300/files/oxigenoterapia_enfermagem.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8419/files/chuyen_file_anh_sang_word.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/just_already_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0437/2735/6056/files/49938108263.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/51679390215.pdf
    • https://cdn.shopify.com/s/files/1/0433/9089/4247/files/power_plate_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/cellular_pathology_an_introduction_to_techniques_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0430/5394/0887/files/lupox.pdf
    • https://cdn.shopify.com/s/files/1/0432/7594/4091/files/96896086175.pdf
    • https://cdn.shopify.com/s/files/1/0435/8556/8923/files/kusezuledevaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/systematic_and_unsystematic_risk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/mcdougal_littell_geometry.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/9005/files/8185891459.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/38515426594.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_off00006bac.bin
217f40f5fcb22699e80f9cba113f05774fb476bfd9a83e6b7c35156aac6949ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAC 5228 bytes
font_01_sfnt_off00007d69.bin
a192fbd5bc47a08f8e053dfae4a4f59035171f9e816e8c1e754c9d864b7422d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D69 11236 bytes

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