Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc580f5c230f5183…

MALICIOUS

PDF

40.0 KB Created: 2020-08-29 22:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 309a0563c841cf8cf2e937c2c288306b SHA-1: 4b21bce39d6461c9bf318821a826f2418c86e792 SHA-256: bc580f5c230f5183321f595560609ad095e56b8ab57a994edc2d003b0bc8157f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is associated with a student loan scam lure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains hosting other PDFs. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering through deceptive links within the document.

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/wix?keyword=i+need+a+student+loan+with+bad+credi
    • https://cdn.shopify.com/s/files/1/0452/8416/3746/files/gonorrea_bacteria.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2310/files/47219668113.pdf
    • https://cdn.shopify.com/s/files/1/0449/2699/2551/files/pdf_smaller_size_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/xoxipob.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/the_weekend_eminem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/xamaxokajar.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8615/files/vefera.pdf
    • https://cdn.shopify.com/s/files/1/0460/1351/3889/files/bioorganic_med_chem_letters_author_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/xaxesonakugixewemub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevadijuxirefasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0587/8170/files/search_ed_image.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8245/files/1230789211.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/1359071454.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/xixaka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalekubaserigudopen.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_off00005ee1.bin
d7f3765a40dd7889f624a8989f5474b5c7863908f9cb9bfc728f7d2a01342279
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE1 5196 bytes
font_01_sfnt_off0000708c.bin
0e1a4a6f6980c61c9ec6e75e041b416c931409275f3151b6826b50921d9df8cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x708C 10204 bytes