Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dba91bebaa38169…

MALICIOUS

PDF

41.0 KB Created: 2020-08-07 18:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb01399f2e921e0391366a9679c0d176 SHA-1: 90ab7a4c84e4f04d38f86fe8060a9c9974edf263 SHA-256: 4dba91bebaa381693c3d9b8d7a963e69f797376cd142b0058c4f7cda024f99fb
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with a large number of embedded URLs pointing to external PDF files, many hosted on Shopify. One of the embedded URLs, 'https://ttraff.com/pify?keyword=substitution+effect+definition+pdf', is identified as a malicious redirector. The document body is heavily obfuscated and contains what appears to be the same malicious URL embedded within it.

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=substitution+effect+definition+pdf
    • http://dezeda.hangrynoodle.com/uploads/1/3/1/4/131407535/tivapajoliw.pdf
    • http://files.rhythmresearchresources.net/uploads/1/3/1/6/131606127/gelizoxi-mevep-xuzumifam.pdf
    • http://files.happygreenjeans.com/uploads/1/3/1/4/131453276/momive-situkotor-wurazub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93336639176.pdf
    • https://cdn.shopify.com/s/files/1/0440/2606/9157/files/20809386464.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0181/files/cheats_of_gta_vice_city_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8791/1319/files/sinaji.pdf
    • https://cdn.shopify.com/s/files/1/0439/2108/0475/files/adc_analog_digital_converter.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/document_class_latex.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/serology_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0429/1585/6550/files/8931067117.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/disasawaduvulenutige.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/botulism_symptoms.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/puben.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/38663819976.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/ticket_reservation_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/3365/5446/files/sazajatolarowolavufuraj.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_off00006197.bin
5925c3dfdd8073a356f0aef792d5baba7f5079394c6431ba6589d5deae506d00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6197 5056 bytes
font_01_sfnt_off000072dc.bin
1f9448db55950c5c238f7659beb64071ae1c1f74f22bde2d46333845a8ddcc80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DC 10536 bytes

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