Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6a6d40348c16ec…

MALICIOUS

PDF

47.8 KB Created: 2020-08-08 08:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8c0e5619597c679c70245092f50f6e7 SHA-1: 4ac8941bb492dbe09a2320f1a0b1f209d45ad612 SHA-256: 6f6a6d40348c16eca6de3785600a89b2d488fd183d551ec963008fccd92ee437
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.ru, which is likely intended to lead the user to a malicious site. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt to improve the ranking of the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=alimentation+ent%25C3%25A9rale+pdf
    • http://files.amandaackleydesign.com/uploads/1/3/1/8/131856333/tasis.pdf
    • http://files.kspaceonline.com/uploads/1/3/1/3/131380868/b7e90.pdf
    • http://sofuvegev.travistagpta.org/uploads/1/3/1/4/131483281/78a1a3f97dde46.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/82858756127.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/xebarizuwuxerukuparog.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/brain_drain_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0434/2572/6625/files/les_adjectifs_interrogatifs_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0437/7454/1981/files/obstructive_jaundice_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/30396581121.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/mosonodazurijujim.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/rosapelorifo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7446/1594/files/93302278129.pdf
    • https://cdn.shopify.com/s/files/1/0429/8611/1137/files/65016526749.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/sosupetopimatevegigawowaz.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_off00006c93.bin
a125acde3639ba0228aa7ed5a42ef1d4b47e03d859f4d9a5b4e327d139c0e340
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C93 5140 bytes
font_01_sfnt_off00007db2.bin
89d4b8ea3c316d8c2cb941be5aea2340090dbd069046db4597030e85c44e05b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB2 17428 bytes