Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a31ac550357f408…

MALICIOUS

PDF

57.6 KB Created: 2020-08-18 19:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98b2b4a78d646da46129d50bb99424c9 SHA-1: 0ef3de6a157f9d924ba304fa5c886de0b4b15659 SHA-256: 7a31ac550357f4087bc07daeb552811ae59104df8ffd7070a44a85a1e37dac45
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms and redirector infrastructure, including a critical link to ttraff.com. The document body, though malformed, contains a reference to 'ecdc measles report' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a phishing or scam attempt.

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=ecdc+measles+report
    • http://files.jontigert.com/uploads/1/3/0/8/130813528/jofikejur.pdf
    • http://files.united-townfinancial.com/uploads/1/3/2/6/132696210/a2a174cfc.pdf
    • http://wobefotol.jongagnoncomedy.com/uploads/1/3/0/7/130776031/8200521.pdf
    • http://files.scrapmetalcollection.com/uploads/1/3/0/9/130969389/17216d18c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/20393536838.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/nobirugozikipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8998/4674/files/tagopel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3755/files/29323284525.pdf
    • https://cdn.shopify.com/s/files/1/0434/5646/3001/files/turn_off_wifi_direct.pdf
    • https://cdn.shopify.com/s/files/1/0431/9890/6528/files/juwogebiwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/d_d_circle_of_death.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/56911049558.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5971/files/mojokamunodibuguxoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/wumorudesifikedipu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/ardaas_punjabi_movie_mp4.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008eda.bin
f97017a22a421b1265676094b6128aa502e31e83ce044f127cfef648488deb59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDA 5176 bytes
font_01_sfnt_off0000a052.bin
69273c208c8c4859ab902c50201f685517a1897a11c14a10228bb88b73dbac36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA052 10304 bytes
font_02_sfnt_off0000c3c2.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C2 16204 bytes

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