Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfa62e1faf8d040…

MALICIOUS

PDF

63.0 KB Created: 2020-09-01 02:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6769b52c6d008fca6aceca609dec5e67 SHA-1: dc93c93dbc89f2fe96a0acc4df463378d94dde89 SHA-256: 5dfa62e1faf8d040c64c0e5211daac0325e80e9b51c6d5fb86e3d04a883fa68e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. It also exhibits characteristics of a PDF link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=proper+deadlift+form+starting+strength
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/benopuzut.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/cogat_practice_test_kindergarten_an.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/86166188367.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/kuzunujonoxabo.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1c1b08528504a6386fbecff564c815f.pdf
    • https://static.usrfiles.com/ugd/de02f3_b7b609fbe56b412394a441362eff9f3f.pdf
    • https://static.usrfiles.com/ugd/a107db_0073578dc6ba41189ae6cce158cc1194.pdf
    • https://static.usrfiles.com/ugd/9757e7_f4ff788980c94a55a86c12440438afc3.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/62467334291.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/58637706632.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/sipigamaludufuviz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/hep_b_treatment_guidelines_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/small_business_plan_format.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_off0000b923.bin
ea1af5818a77675f48493542f5f42810a4f8b951305ad27bd51bc5d45068a596
pdf-font-stream PDF embedded font (sfnt) at offset 0xB923 5456 bytes
font_01_sfnt_off0000cb85.bin
8fe6f41aebca8b5f7208a7ac1dfb64483dd8de2e9877279b69150a5e02037c87
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 10352 bytes