Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43f9a6f85f59294…

MALICIOUS

PDF

55.3 KB Created: 2020-08-22 19:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed75e378f2f3b4a89df5320f5964a2e6 SHA-1: b940ddaca1a1ecf53515bae75524d99206cd6eba SHA-256: f43f9a6f85f5929482889134f8acfdc4f82ab308f7b0563fb7de3eeda26ee66e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a high number of embedded links, many of which point to external PDFs, a technique often used for SEO poisoning or to obscure malicious destinations. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=asme+bolt+torque+chart+pdf'. The document body, though heavily obfuscated, contains text related to technical charts and the wkhtmltopdf generator, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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=asme+bolt+torque+chart+pdf
    • http://files.tombreed.com/uploads/1/3/0/8/130813650/powixulonuvit-lonedovime-tizezopilin-monokadozavegil.pdf
    • http://wifux.canadianregtech.ca/uploads/1/3/0/7/130775934/juxudexo.pdf
    • http://wuroxe.adventurerefined.com/uploads/1/3/1/4/131452938/duzuwuserolakula.pdf
    • http://files.tactic-construction.com/uploads/1/3/1/3/131383429/biwugodetitiko-pajojufelatu-timasalatup.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/bezier_curve_in_computer_graphics.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/jeravapujufekelok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0433/1605/2123/files/9954329745.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7473/files/basic_russian_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0791/files/11145272278.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/action_3d_audio_songs_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1398/files/download_ios_9._1_beta.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/nofipaludulivawobuxu.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_off0000826c.bin
9128e4516227841fc704392a6f3d723db4b97dab3ff4e0ce82805790ceaaa9c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x826C 5376 bytes
font_01_sfnt_off000094a9.bin
dab8d62fe6d8b12e69232f3e2ae761fc8b9556ef696882d6bb5a7b38aa7e8ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A9 14692 bytes
font_02_sfnt_off0000c229.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 4324 bytes

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