Malicious PDF — malware analysis report

Static analysis result for SHA-256 9141ea4b33063d43…

MALICIOUS

PDF

56.2 KB Created: 2020-08-30 18:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08feb37c377b8f5eec3d668fc36c2a97 SHA-1: 6452ff36041224becc183bfe191cf5ded65cf0fa SHA-256: 9141ea4b33063d43cd8fd0852b7a60c8fd15abf2ef109406e0a6f10f08676283
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a large number of external PDF links, characteristic of a link farm. The embedded URL https://ttraff.com/wix?keyword=race+ethnicity+gender+and+class+7th is the primary indicator of malicious intent, likely serving as a lure or phishing page.

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=race+ethnicity+gender+and+class+7th
    • https://static.usrfiles.com/ugd/286fb8_75b6537d7d88412caf601503f3ce4f98.pdf
    • https://static.usrfiles.com/ugd/0a0016_73ef48601a08474c83fa13243a8a3f6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd9d5ca1546f425fb01233295b19e73b.pdf
    • https://static.usrfiles.com/ugd/0e2875_f8c9bbfd47a8407cb17734413665dd2d.pdf
    • https://static.usrfiles.com/ugd/9cc572_dffe15660f9e402a976ecfdeab57b9cc.pdf
    • https://static.usrfiles.com/ugd/0047a4_3b2ff9fef3324f2db68786bcab0d75e1.pdf
    • https://static.usrfiles.com/ugd/f4de5e_8f8a54cfe92d4ee09724ddbe4b473c89.pdf
    • https://static.usrfiles.com/ugd/0f5b72_2432e9a3ce9845b0993274803451ab16.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5756/files/php_size_of_array.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/78155480832.pdf
    • https://cdn.shopify.com/s/files/1/0432/3963/7155/files/training_certificate_format_for_mechanical_engineers.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_off00009eb0.bin
0e1c40873d000ccdda2f86ec508e85c1e76e7f286830f3437c8dddf1ddb4f754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB0 5392 bytes
font_01_sfnt_off0000b101.bin
42d1fff0ad466dab4dde4fd224b29758ee54687b596ab33eb9c10ffa59c83b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB101 10292 bytes

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