Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea66ff991b2a5a79…

MALICIOUS

PDF

45.5 KB Created: 2020-08-17 14:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ee652ac5a2b2721b4258ca8b608a2aa SHA-1: 165e4318bff943738bfc02bf42a9465a91949a49 SHA-256: ea66ff991b2a5a7969aeb4e35699a82d22f324ef7447896540b6235b7ad881e9
152 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=application+for+american+passport+forms'. This URL is presented to the user as a link for 'Application for american passport forms', indicating a social engineering lure. The document also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. 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.cc/pify?keyword=application+for+american+passport+forms
    • http://files.ceplastics.com/uploads/1/3/1/6/131637043/70d8b31fc57.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8828/files/romasuteradufumi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8741/9805/files/tamavanozetofusixopodene.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/3719885360.pdf
    • https://cdn.shopify.com/s/files/1/0429/0589/5075/files/alleluia_jubilate.pdf
    • https://cdn.shopify.com/s/files/1/0439/4788/4702/files/are_you_smarter_than_a_5th_grader_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/mokewe.pdf
    • https://cdn.shopify.com/s/files/1/0439/9667/6254/files/pedep.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/dimenipirubokix.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/faiths_of_golarion.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.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_off00007461.bin
10db74250d69f17cf337604d7c46f8777353bc7cc77fec87fdb8996af0e17ccf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7461 5152 bytes
font_01_sfnt_off000085c2.bin
5547880627f49bd9aecd58d00674dfb912c0e4774c4bd07d6ad7ba2d1d6da68e
pdf-font-stream PDF embedded font (sfnt) at offset 0x85C2 10412 bytes