Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ba4982d9be20f7…

MALICIOUS

PDF

39.0 KB Created: 2020-08-12 09:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9d643746ab40906c05d84fee73ac81e SHA-1: 2420d372e7cac0420f86d0025f67149cf7601c61 SHA-256: d5ba4982d9be20f70974c0ba294e77aaf48c3127a929e7eb74bf105f287f738f
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results for free book downloads, ultimately redirecting to malicious infrastructure at ttraff.ru. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a SEO poisoning tactic to distribute malware. No scripts were extracted, but the embedded URLs are sufficient to indicate a malicious redirection attempt.

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.ru/pify?keyword=abdul+hameed+adam+books+pdf+free+download
    • http://files.statenislandsolarcar.com/uploads/1/3/1/1/131163859/20876869825a.pdf
    • http://files.enamelchannel.com/uploads/1/3/2/7/132710779/vutoxovezimenumu.pdf
    • http://files.wyndcharmsilkenwindhounds.com/uploads/1/3/1/6/131606343/fidavanuwu_busasalim.pdf
    • https://cdn.shopify.com/s/files/1/0435/2645/5455/files/53791181917.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/43262630784.pdf
    • https://cdn.shopify.com/s/files/1/0433/4010/3845/files/35007933007.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/1968_dodge_truck.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/jomago.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/remamokaroti.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81256704061.pdf
    • https://cdn.shopify.com/s/files/1/0433/4105/4111/files/although_however_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/6550/0060/files/86659227895.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1735/files/valekutifojitibepavurafer.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/53205682884.pdf
    • https://cdn.shopify.com/s/files/1/0440/8508/4310/files/76943911384.pdf
    • https://cdn.shopify.com/s/files/1/0429/2699/7663/files/workbench_design_book.pdf
    • https://cdn.shopify.com/s/files/1/0444/8750/8135/files/ansi_b16_5_flange_dimensions_in_mm.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a14.bin
cb75a5e542df46ac7af7ad704190dfe7e91c743175c0188b62cb586d0e41e8da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A14 5320 bytes
font_01_sfnt_off00005c0d.bin
5d68ea3a19897d25ec68709505a75a27395f2b48e973b216e2b43d1a41f4966e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0D 10684 bytes
font_02_sfnt_off00008072.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8072 4324 bytes

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