Malicious PDF — malware analysis report

Static analysis result for SHA-256 8674c820a99a5419…

MALICIOUS

PDF

34.1 KB Created: 2020-09-18 10:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebc800af26710aeea4d35ee441c07380 SHA-1: b94d77963d6a76486a301bb18f9ff3aff7f5d099 SHA-256: 8674c820a99a5419c87cd1d011e2aa840d98196764ef07eb452e109eee8be7ba
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=dynamic+round+hole+wheels'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to PDFs hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body contains the malicious redirector URL and several benign-looking PDF links, suggesting a lure to external content.

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.link/wix?keyword=dynamic+round+hole+wheels
    • https://cdn.shopify.com/s/files/1/0468/0145/3205/files/18772298362.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/carothers_performance_knives_edc.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/fawatisoridodiwoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/roxidimazawisinabifixebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/melinuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/bsc_maths_syllabus_mg_university.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2261/files/story_book_to_learn_english.pdf
    • https://cdn.shopify.com/s/files/1/0465/3803/1254/files/22077654294.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/mibop.pdf
    • https://077d92d1-a6eb-4c6c-8311-63c23e0556b6.filesusr.com/ugd/fb5067_b116979935ef4bff921460009673df9f.pdf?index=true
    • https://90a9d72a-93ee-45c6-b273-ffb7a9762ec8.filesusr.com/ugd/838e7e_c2181fae0e504f2f8963aad10854c5e8.pdf?index=true
    • https://1ce4df32-b8d6-47bf-b9b1-d2a7a3874272.filesusr.com/ugd/008a9f_01b298d7b89747a89edaf74d9e79bcf0.pdf?index=true
    • https://e7fabd2e-ea05-4102-9dc1-dacaf3c28ff8.filesusr.com/ugd/35ddae_22383a3f38584ccdb8f10e9504c268a3.pdf?index=true
    • 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_off00004860.bin
11b747979565ccff7cec60820fcbac3d90a966399d7383a15878adfaf173b270
pdf-font-stream PDF embedded font (sfnt) at offset 0x4860 5372 bytes
font_01_sfnt_off00005a94.bin
5d30f2307b46c3b4c65c0e62a31d0b38a4bb36945247deb81d0601e5e8242ec6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A94 9764 bytes