Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e582bfa7adb137…

MALICIOUS

PDF

42.8 KB Created: 2020-08-31 08:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd672d76d49b4ed27be132b785b9570 SHA-1: 4e2ad51b7d7d8f3fdbd59d9cbbcd7ce0696919ac SHA-256: a2e582bfa7adb137c430682d194930b65f1291db8e69288b120b25339f78d678
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a software serial key. The link points to ttraff.com, which is known for redirecting to malicious sites. The document body also contains a large number of links to Shopify, likely part of an SEO link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness.

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=dragon+naturallyspeaking+13+serial+n
    • https://cdn.shopify.com/s/files/1/0448/0398/1463/files/watariga.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/60217258029.pdf
    • https://cdn.shopify.com/s/files/1/0464/9415/4904/files/kaguvigetosixoriz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7438/files/11026359646.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/canaliform_dystrophy_nails.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0561/files/axiomatization_of_the_theory_of_relativity.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/fivezotakirufomerotumota.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/52357607472.pdf
    • https://cdn.shopify.com/s/files/1/0430/4853/4167/files/ascanio_in_alba_vocal_score.pdf
    • https://static.usrfiles.com/ugd/b52961_43194721c17b4bb694c0c9ec90ec47c0.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_4991575bbb7c4f6c994b927c6c6cef1a.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_off000067c2.bin
5186a00c71ced23e8628bcfa2f836c5a4a3490a504fb74565396e8191e0182bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C2 5368 bytes
font_01_sfnt_off00007a2b.bin
a634bab4e0f08229fb4a7a644eb0a47324082e372a7c51f147f16e55d33f8c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2B 10656 bytes

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