Malicious PDF — malware analysis report

Static analysis result for SHA-256 0376dee3ffc63ae8…

MALICIOUS

PDF

63.3 KB Created: 2020-08-20 13:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5da2a5a55c91f1d4634db218f68c03e SHA-1: 2ebaabc0aa200ae093c140ae55e6f2345dc7a08f SHA-256: 0376dee3ffc63ae8b4f9ef2934034976eab6722df46cb0472fb86adaeb6f7a3c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself facilitates the 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=jcaho+blood+transfusion+guidelines
    • http://files.kcbevco.com/uploads/1/3/0/8/130874655/2dc6a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9623/4400/files/8688527002.pdf
    • https://cdn.shopify.com/s/files/1/0427/8566/9279/files/wepuwituresekokowonodawas.pdf
    • https://cdn.shopify.com/s/files/1/0435/7757/3539/files/golonagatefedixowa.pdf
    • https://cdn.shopify.com/s/files/1/0448/5578/7681/files/manaclavado_en_un_bar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7037/files/bookkeeping_vs_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/78761839448.pdf
    • https://cdn.shopify.com/s/files/1/0434/5502/1223/files/jerikepatuwotadepeke.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70282461387.pdf
    • https://cdn.shopify.com/s/files/1/0432/8099/0366/files/67462044702.pdf
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/equus_africanus_asinus.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/definicion_de_calidad_de_vida_oms.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_off0000a35a.bin
4d6ec1bb6ca22d1a47ff5406fe5373eab337950c40a0caa4a1d3d0db3745d578
pdf-font-stream PDF embedded font (sfnt) at offset 0xA35A 5412 bytes
font_01_sfnt_off0000b5af.bin
722cc055622d7fa67846998a26e94def261c84c5affc5363372f629394bc0c59
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AF 10780 bytes
font_02_sfnt_off0000dab4.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 16204 bytes