Malicious PDF — malware analysis report

Static analysis result for SHA-256 689802692a8390ef…

MALICIOUS

PDF

41.8 KB Created: 2020-08-12 17:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b21ea595b0bbaafe9dc17d1de0be9136 SHA-1: 39a88d73b9ec589e29dd1375b8d72654ca706471 SHA-256: 689802692a8390eff2b94985b3df69aa0efd4f6b0126e81cbe93dd3d5ec08031
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the malicious URL and references to academic PDFs, reinforcing the 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.com/pify?keyword=pretest+biochemistry+4th+edition+pdf
    • http://files.gbcoa.ca/uploads/1/3/1/3/131381363/kipowes.pdf
    • http://files.florencetrackclub.com/uploads/1/3/1/4/131407178/tovoj.pdf
    • http://files.lechicacademy.com/uploads/1/3/2/6/132681863/be07ad994752ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7386/2808/files/immunization_chart_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/82063823108.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/78212140948.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/mezuzunesa.pdf
    • https://cdn.shopify.com/s/files/1/0437/3718/6458/files/beginner_s_guide_to_sculpting_characters_in_clay.pdf
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/36959798900.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/calendario_lunar_octubre_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/7980358108.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bibekejufalakudogaloseja.pdf
    • https://cdn.shopify.com/s/files/1/0429/5006/6339/files/beginner_s_guide_to_weightlifting.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/seresope.pdf
    • https://cdn.shopify.com/s/files/1/0433/1808/3742/files/zuxitetup.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/biography_of_abraham_lincoln_in_short.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006663.bin
354aa35e9161f2a75e4c692a2e9c6e498e7aea1a7708cec08c422ca7d26d803d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6663 5484 bytes
font_01_sfnt_off000078e9.bin
9159ea3fe6c87b299cafd2e67da6a8fa49bed82f9a84bad22be36fb9c347fe13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E9 9812 bytes

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