Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6e7f27cdedd224…

MALICIOUS

PDF

52.7 KB Created: 2020-08-04 19:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 157b1875c653913e22f3b2f0acd3e7cf SHA-1: 7977297ba0c63a7f00da7e4851343d71dc054d45 SHA-256: 7e6e7f27cdedd2244ffda9a4a2b2a23dd3cc139ac44c3cde81c3a787ed2267b4
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text fragments related to attaching pictures to PDFs and mentions the wkhtmltopdf tool, suggesting a lure. The presence of numerous links, including those hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=attach+pic+to+pdf+online
    • http://files.sagehealth.co.nz/uploads/1/3/0/8/130874284/wokutepur.pdf
    • http://files.elginparkathletics.com/uploads/1/3/1/4/131406413/xikudenaw.pdf
    • http://files.plan-my-trip.eu/uploads/1/3/1/3/131380485/vuvowizoxu.pdf
    • http://files.venturapaintparties.com/uploads/1/3/0/9/130969742/a58292f3d29.pdf
    • http://files.spiethandsatow.com/uploads/1/3/1/8/131856672/374322.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9659/files/kurilejekeveverulutop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/sekineravujutapafizow.pdf
    • https://cdn.shopify.com/s/files/1/0429/8149/0847/files/38728561813.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/jquery_xml_to_json.pdf
    • https://cdn.shopify.com/s/files/1/0436/2646/3385/files/valupikap.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/jurimizobidiraxusanesox.pdf
    • https://cdn.shopify.com/s/files/1/0429/3053/6614/files/21053192317.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/rigiraxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0885/files/grade_12_physical_science_module.pdf
    • https://cdn.shopify.com/s/files/1/0434/1838/6588/files/associated_press_stylebook_2015_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/gofupexutotemadego.pdf
    • https://cdn.shopify.com/s/files/1/0435/3350/0565/files/38132758176.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/pokemon_mystery_dungeon_explorers_of_sky_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6629/files/6254495526.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_off000084c9.bin
29d16da309b4035b3be2fb9d36998972d966418e84d37c85ddd19994d456e0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C9 4956 bytes
font_01_sfnt_off000095af.bin
09a2aebfd3f5f13691eae528de8c8a2be3e0b64e195cf918bf0056dd2b6fa2ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95AF 15716 bytes

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