Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb5a14a1de5a0ef…

MALICIOUS

PDF

40.4 KB Created: 2020-08-22 17:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7ff75ae7aaf9e8ef6aed2ab82e9ea0b SHA-1: 633af24e67602b7d3b83851182e1cb9d67bc2124 SHA-256: ceb5a14a1de5a0ef03d3a48f69d4c05eb4132f5700063f5d6fead9f646381123
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service (ttraff.cc) known for malicious activity. The document body, though heavily obfuscated, also contains the same malicious URL. The presence of a link farm heuristic further indicates an attempt to distribute malicious content through numerous links. No scripts were extracted from this sample.

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=cervical+cancer+signs+and+symptoms+pdf
    • http://kageful.hansenrestoration.com/uploads/1/3/0/7/130739602/1824376.pdf
    • http://wafava.fasttrack.cognitiveguidance.us/uploads/1/3/1/1/131164406/sisotiseb.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5174/files/91901679720.pdf
    • https://cdn.shopify.com/s/files/1/0432/1191/5421/files/6387519532.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/7599889046.pdf
    • https://cdn.shopify.com/s/files/1/0440/4966/2117/files/cambridge_international_dictionary_of_phrasal_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/50327813813.pdf
    • https://cdn.shopify.com/s/files/1/0433/8411/1267/files/answering_interview_questions_format.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/bozijukikaxudodusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6382/8895/files/78700793754.pdf
    • https://cdn.shopify.com/s/files/1/0437/9957/6733/files/batilokamakuboxezadezaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1671/files/xisilukizukosexewizesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/champcash_old_version_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/1282/2939/files/rasepezegepa.pdf
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/xewipukorudimosifanu.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_off00005bf4.bin
c3209765a06fa0bdcbaca3491d389c352226d0ebc82108d117e18bb22fa1a1e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF4 5540 bytes
font_01_sfnt_off00006eba.bin
c12078a19d8127a4914f0680b65bc6460ccf1c8fa6a549360b5cb351e77affaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBA 11708 bytes