Malicious PDF — malware analysis report

Static analysis result for SHA-256 234dd6544a868900…

MALICIOUS

PDF

43.9 KB Created: 2020-09-02 16:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17db5a4dbfa32f38218bd267ca2ee81a SHA-1: 044cbe32567fa809170953bcfd2b997c4fab3ee4 SHA-256: 234dd6544a86890070713cf855969e515e8a6bd4b6ef6f5fa57bbf5de5c1a6c8
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.link, disguised as a document about 'Lord of the Flies' quotes. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document also contains a large number of links to other PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious 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=lord+of+the+flies+character+quotes+pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/flexagon_guides_golf.pdf
    • https://cdn.shopify.com/s/files/1/0445/6205/5332/files/accurate_english_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0430/4823/9257/files/remumadixexatora.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/44796169610.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2848/files/wutuwolebuluwe.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/xujibixutilupilofutitip.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0762/files/agastya_samhita_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0491/files/futijawimekunibidekir.pdf
    • https://cdn.shopify.com/s/files/1/0441/0333/6088/files/erik_erikson_childhood_and_society.pdf
    • https://static.usrfiles.com/ugd/7198c1_23f0b1d0517d4f7cbb9039579cc8e23b.pdf
    • https://static.usrfiles.com/ugd/ddb60a_5bdf1935b68144ed92f59465282b80fd.pdf
    • https://static.usrfiles.com/ugd/f3cb45_4b7364253285426393e2e0ee2d4abc29.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa43d1a18dd641ab8843f3894462de78.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_b3740b5a51744fdab55d9565d3574e55.pdf
    • https://static.usrfiles.com/ugd/909b15_420a901ef2f54e5ba8c3db395b1c55fd.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_off00006d9f.bin
991fc2877d6ac71f1af90de5c09d0bc9c9d67aad8d4fdd08ac67a399ecba952a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9F 5312 bytes
font_01_sfnt_off00007faf.bin
fe39a953d77c66c6db3b22b8246e740f17f6a89b625c2dcebb4b246191c66f50
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAF 10500 bytes