Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b325a67c509a7e5…

MALICIOUS

PDF

48.5 KB Created: 2020-08-30 16:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dbfcf69c351e60b5e6b43ab5b6f2ded SHA-1: ecccaafc80f3d5a4db60d8ccf3b346e41f667e43 SHA-256: 5b325a67c509a7e5e7b498f6fe8e34665c225d7a9ba837279978e729d16a3116
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. The embedded URL is likely intended to trick the user into visiting a site that may host further malicious content or phishing attempts.

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/wix?keyword=ntb+wheel+alignment+coupon
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/pajemukaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/hinario_vo_corrente.pdf
    • https://static.usrfiles.com/ugd/4479ed_f473296706fe4053bc1ed2fc1d0e6093.pdf
    • https://static.usrfiles.com/ugd/353d00_17c924b2e1964128869d6b191e5e0edf.pdf
    • https://static.usrfiles.com/ugd/784815_777a5ca7f38b43628f71c898a4b565c1.pdf
    • https://cdn.shopify.com/s/files/1/0428/6477/1238/files/34636848635.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0742/files/tipp_distress_tolerance.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/arithmetic_series_and_sequences.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/adobe_illustrator_fonts_pack.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/john_deere_push_lawn_mower.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e6a.bin
51c0d1c15a2d4c0ba984a9bf22b73085ef63308eea5a5177c32700a6c0472804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6A 5272 bytes
font_01_sfnt_off00009048.bin
cacb0d30fb4e7456a15f77af857019f5bf6af0fceb27e4c1346f1c3bdb6ddbad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9048 10820 bytes

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