Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f03c4b0390be8be…

MALICIOUS

PDF

51.8 KB Created: 2020-07-30 07:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f46861952b56a79de64799b3408d488 SHA-1: a875a77c223a3b55cf4692f55ac96baea04dc1dd SHA-256: 7f03c4b0390be8be24f9f41b9919fd816721861eb8440acf7cdde5e021127e38
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, suggesting an attempt to distribute malicious content or traffic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated and unreadable.

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/pify?keyword=adolescent+health+education+pdf
    • http://files.itechtutoring.com/uploads/1/3/2/7/132710783/9200262.pdf
    • http://files.schoolofhardknocksnc.com/uploads/1/3/0/7/130738712/wanajelakezaruvesop.pdf
    • http://files.akita-inu.com.pl/uploads/1/3/1/1/131163846/texop-garubeferaru-pufek-bujutajiger.pdf
    • http://files.mohicounseling.com/uploads/1/3/1/6/131606094/1553198.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7355/2028/files/tefumopokugizovibovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75278808376.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7779/files/27398245201.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/63042484705.pdf
    • https://cdn.shopify.com/s/files/1/0427/5834/0774/files/sefomimifikesupos.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/zaremenaxalufisewa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/50630287240.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/67565542808.pdf
    • https://cdn.shopify.com/s/files/1/0430/6731/0231/files/pawavububaxujutabepi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/43299167101.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/31041899812.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/26854335084.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufowotipopugisafe.pdf
    • https://cdn.shopify.com/s/files/1/0438/6367/0939/files/xodafofuzokusigufera.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_off00008d26.bin
ce616ef61410d40f40c22fbce7361d3bccea97bfa00d7b1a8a338b5abf746512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D26 5016 bytes
font_01_sfnt_off00009e33.bin
7345b0eb233ac4477548b18ede7bc3a3644892c0e2bd98b3bc83425a0c6fd58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E33 10532 bytes

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