Malicious PDF — malware analysis report

Static analysis result for SHA-256 112773d7afe9376c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 12:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a45e30a1de667294db17b7d6b2d4cf1f SHA-1: e8e204d3b627accd3b31e37f1c10add38cb0edcd SHA-256: 112773d7afe9376cd35409f01579f26468b451efd46596fc0baa19b9384953b4
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is presented as a 'League of Legends runes guide'. This heuristic, combined with the ML classifier flagging the PDF as malicious, indicates a phishing or scam attempt. The PDF also contains a large number of links to other PDFs, suggesting a link farm or SEO manipulation tactic.

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/wix?keyword=league+of+legends+runes+guide+season+9
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0a593f_b7e03e9698c8461799bc3e7946cfb109.pdf
    • https://static.usrfiles.com/ugd/b98abb_21e47077927849a9a53c43ab9ae4c1ab.pdf
    • https://static.usrfiles.com/ugd/238140_c26bbaf865b74ad8a1c12f5a69d9de7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c89d68849be6470da648a9c094566a68.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/sefex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8962/files/zezotigife.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fusuzirosaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/poxatolezexobunamux.pdf
    • https://cdn.shopify.com/s/files/1/0434/7081/5397/files/b_tech_mechanical_engineering_subjects.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/17181039058.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/3579571236.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/zirewepinevano.pdf
    • https://cdn.shopify.com/s/files/1/0431/0617/3077/files/fallout_new_vegas_gun_runners_arsenal.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_off0000624f.bin
573e3cd51904cd33ab90cbc9bd89c00f9234ac8437940ca6ab9a405f63945660
pdf-font-stream PDF embedded font (sfnt) at offset 0x624F 5172 bytes
font_01_sfnt_off000073fe.bin
f5bfe4e32eb178d79843e39f3bcd32be8bfc2e07b80c66b428731d2a71652ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FE 14456 bytes