Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3421024f47e4d8…

MALICIOUS

PDF

38.1 KB Created: 2020-08-12 01:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc6d439877bda67005e0c680cceb545d SHA-1: ec0738762ef02100c698139173fca77aa5818252 SHA-256: ad3421024f47e4d8f56f13f42fe55385f5a1277e7a2c30c975662084fea55344
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting it is a 'Barron s gre word list pdf', a common lure for phishing or malware delivery. The ML classifier strongly supports the malicious verdict. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=barron+s+gre+word+list+pdf
    • http://vunotep.ridemchorses.com/uploads/1/3/2/7/132741593/wopidumafepolebiv.pdf
    • http://files.hollandpep.com/uploads/1/3/1/4/131437619/0a148a8.pdf
    • http://files.mareadingcouncil.com/uploads/1/3/1/8/131871643/dufudobaxil.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2995/files/skf_bearing_designation.pdf
    • https://cdn.shopify.com/s/files/1/0438/8978/7048/files/detective_pikachu_bulbapedia.pdf
    • https://cdn.shopify.com/s/files/1/0429/4646/1855/files/griffith_livro_genetica.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/togirivimosukaramamugifod.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/75727182358.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/digoxajejuledimomajok.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/35933625930.pdf
    • https://cdn.shopify.com/s/files/1/0431/4369/2445/files/punapulefoleradufilifa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8661/7501/files/77498768493.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3715/files/carol_of_the_bells_choral_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/7207/8499/files/57995954109.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_off00005753.bin
3f7887d72c56cfb7d39d02509079234371fa62373f2a41bb73b38e63b9e0c106
pdf-font-stream PDF embedded font (sfnt) at offset 0x5753 5348 bytes
font_01_sfnt_off0000699e.bin
c0741924e0157a4c7d4c9b25a2097ebe4d8d185841575862dde22b751e1bea1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x699E 9940 bytes