Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc39b718a8d46b53…

MALICIOUS

PDF

40.1 KB Created: 2020-08-17 06:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9424f8e7d326ddfbcb0d9be848cc53b SHA-1: 9175d5900fb85a29a7ee314fd9ab50864718c3a2 SHA-256: bc39b718a8d46b53277876308fadd2754b64f7d32ebc0112f5bc4c0c04b59c19
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=bor.+up.+nic.+in+caste+certificate'. Additionally, it features a PDF link farm heuristic, indicating a large number of embedded links, many hosted on cdn.shopify.com. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and several other URLs pointing to potentially hosted PDF files, suggesting a lure to download further malicious content or lead to a phishing site.

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=bor.+up.+nic.+in+caste+certificate
    • http://wokadozik.windowproductsinc.com/uploads/1/3/0/7/130739826/gakapovejuv.pdf
    • http://files.gsskids.org/uploads/1/3/0/8/130873973/korunavo.pdf
    • http://files.holyinnocentsff.org/uploads/1/3/1/3/131380786/kemoxedabuzureleg.pdf
    • http://files.asportscamps.com/uploads/1/3/0/7/130739789/f785724c2d.pdf
    • http://files.santarosapool.com/uploads/1/3/1/8/131856121/rigupakufi-negetefame-sanokapadawuw-wifefatuwizu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/nufomiwobuve.pdf
    • https://cdn.shopify.com/s/files/1/0430/9303/3111/files/13690347607.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0434/0364/0993/files/jugekagisoketapegamibop.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/25358043737.pdf
    • https://cdn.shopify.com/s/files/1/0438/3532/6624/files/bushfire_prone_area_report_vic.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/roland_barthes_semiotics.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/51736941193.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/amoeba_sisters_video_recap_of_meiosis_answer_key.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_off00005348.bin
f900f534c5feea14069a8a8b282989f12a32550bcaa3bc0d8922328c8a8af3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5348 5056 bytes
font_01_sfnt_off0000648e.bin
03d70a01d8e874c8345386d375faea6d20a1c64647c17820fe1c9dcfb1387f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648E 9712 bytes
font_02_sfnt_off00008600.bin
3e8e1fcf8b6ec5f51cba85f748804f25d76cc5594a1d5011ba21b47f49e3e1c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8600 3432 bytes

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