Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc15c7958ed4737…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 13:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815c5197b4dfa5159b996c0eb384fe81 SHA-1: 7b84423572fd5bd0af8a19d3bf43e50f0b4775c4 SHA-256: 0bc15c7958ed47374771c8c08721796a5c6f60cd13f387f1f080d0c20be1b337
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is ttraff.com, which is used in conjunction with a lure related to 'picsart tutorial editing app'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to drive traffic to potentially malicious content. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=picsart+tutorial+editing+app
    • http://files.learntorideridetolearn.com/uploads/1/3/1/4/131407315/4437989.pdf
    • http://files.themotherwitconference.com/uploads/1/3/0/8/130874009/koduruxur.pdf
    • http://files.ozaukeemob.org/uploads/1/3/0/7/130776363/d836b1c9ceb.pdf
    • http://wojol.preservedsound.com/uploads/1/3/2/6/132696414/ruxunogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3702/2615/files/wakigaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/finufujerez.pdf
    • https://cdn.shopify.com/s/files/1/0437/7565/6097/files/migovezoverivuvewebel.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/xokebesogoxuke.pdf
    • https://cdn.shopify.com/s/files/1/0444/0725/9302/files/accountability_definition_in_management.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/njrotc_cadet_field_manual.pdf
    • https://cdn.shopify.com/s/files/1/0441/1791/7848/files/biwibabufijuxabe.pdf
    • https://cdn.shopify.com/s/files/1/0441/1519/8104/files/bizhub_c308_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0444/8036/4711/files/pozifejeru.pdf
    • https://cdn.shopify.com/s/files/1/0434/7199/5030/files/gakupamiwumumete.pdf
    • https://cdn.shopify.com/s/files/1/0432/2852/8799/files/81274271999.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_off00006417.bin
bb5bc8284326176b42eef76bf66b036b3b6cb56b49ba16fcc4bc9abeddac8c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6417 5244 bytes
font_01_sfnt_off000075ec.bin
10e00685da53de1be0a78b7cffee98d11e8561485a939451f6368995f907fba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EC 9832 bytes

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