Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1bfcd97bca07ab…

MALICIOUS

PDF

134.2 KB Created: 2020-08-03 23:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45b6ca271a1af24e4bb1e7c90cf9bac1 SHA-1: c2a105151553ce086e36092fbbb1d61e57a3889c SHA-256: 6b1bfcd97bca07abdcbaafd7eb9125b6f6ce12f5619ba78cb4380acc0c930c31
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 resources, suggesting a link farm or redirection strategy. One prominent link directs to 'ttraff.ru', identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=biofeedback+definition+pdf
    • http://files.pampaband.org/uploads/1/3/2/8/132815172/giwexakosolegu-sanelarazi-dubizoradaza.pdf
    • http://files.thedelidownstairs.co.uk/uploads/1/3/0/9/130969825/vilagimonu_bigatititabijiw.pdf
    • http://files.alatebloomer.net/uploads/1/3/0/7/130775640/bapivel_tepadodawapa_rixuzisimuref.pdf
    • http://files.billywolfemusic.com/uploads/1/3/0/8/130874201/9415344.pdf
    • http://files.legalmadeeasy.net/uploads/1/3/0/7/130739916/8d0add8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/vumune.pdf
    • https://cdn.shopify.com/s/files/1/0429/1900/2268/files/kewukixobisapoxanajuxid.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/92627396987.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53295895336.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/1133899787.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/51975477288.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/lonizekidisefesukopov.pdf
    • https://cdn.shopify.com/s/files/1/0431/5037/7120/files/69856915911.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/zimipotawaxuwew.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/devotukefapilaxakokalixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/badorof.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/xigiveparagudodididufotum.pdf
    • https://cdn.shopify.com/s/files/1/0428/7453/6103/files/73174656715.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c598.bin
7c74d0b999a6cd1ee880230fff25832b58399cc44c2747e9e92dd10e40422762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C598 4884 bytes
font_01_sfnt_off0001d644.bin
3a91166dae0e9d5cb5026e903a4ecf9b4366dcf2ded4c8c17e9f4c1403dc6cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D644 11048 bytes
font_02_sfnt_off0001fb8d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB8D 4324 bytes

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