Malicious PDF — malware analysis report

Static analysis result for SHA-256 6491bb66253c0e4b…

MALICIOUS

PDF

44.3 KB Created: 2020-08-21 00:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cff5eb84c437a2d7d226cf470d175f16 SHA-1: 0cbb40bef344c5ced62ec519667f9a97652d4eb7 SHA-256: 6491bb66253c0e4b0cc5ec746d90d6142a1ca81c18aad4985619a698834f98c7
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 external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://ttraff.com/pify?keyword=trading+mentors+book+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links and the identified malicious redirector points to a phishing or malware distribution 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=trading+mentors+book+pdf
    • http://files.townofgreenport.com/uploads/1/3/1/6/131637108/6cbbe1.pdf
    • http://files.joshforil91.com/uploads/1/3/1/3/131378868/6121353.pdf
    • http://files.finestofferings.com/uploads/1/3/1/8/131856743/wawavuvawoxuweka.pdf
    • http://xopiwerer.doityourselfdocumentaries.com/uploads/1/3/1/3/131398455/4122499.pdf
    • http://judoje.suzielhafez.org/uploads/1/3/1/1/131164291/dezomunenejedili.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0444/3661/9431/files/48881594767.pdf
    • https://cdn.shopify.com/s/files/1/0431/2717/7380/files/basic_order_of_operations_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/5448/8990/files/metroid_nes_rom.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/angamaly_diaries_movie_masswap.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/aa_plus_driving_school.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9089/files/finikawufuguda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/convert_to_word_adobe_reader_xi.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_off00006e8a.bin
35146672a6e32975a04a64d1b226262cc379688da0741fe3a4c95d6ad4a5c58d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8A 5484 bytes
font_01_sfnt_off00008114.bin
7d890d3af44d1b070a94f975f12359c65be72c198dfa168f7314b00248a1bf41
pdf-font-stream PDF embedded font (sfnt) at offset 0x8114 10240 bytes