Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb365d687b5573de…

MALICIOUS

PDF

51.3 KB Created: 2020-08-16 14:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed33a790a4720f219170a8e817090450 SHA-1: c62aa2ec1b3df36d57e4d7f7efb92888fc65a47c SHA-256: bb365d687b5573de00c9445038a7d046dd8701c2109c5ae4e5839350b85c9dd0
154 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, specifically pointing to 'https://ttraff.cc/pify?keyword=vscode+format+document+c%252B%252B'. This URL is likely used to redirect the user to a malicious site. The document also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to benign Shopify URLs but including the malicious redirector. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm structure indicate a phishing or 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.cc/pify?keyword=vscode+format+document+c%252B%252B
    • http://files.soapbarlounge.com/uploads/1/3/0/7/130776718/luriza_bokitewakikizu_sepipe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5836/3544/files/64686824112.pdf
    • https://cdn.shopify.com/s/files/1/0429/1503/7351/files/acceptance_sampling_examples.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/63473814744.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/41047057354.pdf
    • https://cdn.shopify.com/s/files/1/0429/6205/9427/files/50504931922.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/gawojo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1692/8923/files/chemical_principles_atkins_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/73523059356.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/99533951311.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0501/files/33914804201.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/zekagovixejag.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/blue_exorcist_movie_sub.pdf
    • https://cdn.shopify.com/s/files/1/0434/3794/9090/files/86506396381.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006709.bin
619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6709 2880 bytes
font_01_sfnt_off00007147.bin
bc39babe9baf5660ce6bf26c2a19066f291793a37313908ddb8b67126120069a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7147 5100 bytes
font_02_sfnt_off0000827c.bin
aead662b77bd08d8bc3a32503fe697cdb26ead34b34030c4a081135ad3e8dded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x827C 11300 bytes
font_03_sfnt_off0000a91f.bin
863699c8b4f28e8870074e08194d9d61b2861a2aef552398a54e4af87acd5ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA91F 16524 bytes

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