Malicious PDF — malware analysis report

Static analysis result for SHA-256 780c6ab6cc6092e6…

MALICIOUS

PDF

46.2 KB Created: 2020-08-10 17:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8273f3533cbbbbcc1c255f54011042c SHA-1: 8a681c747510c2dc552162a096065b147d854f6e SHA-256: 780c6ab6cc6092e6a9e29ddc24cf4ebee64dd7530dc20ee1b27ff4a88b539a82
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.ru'. The document body also contains this URL, along with numerous other URLs hosted on cdn.shopify.com, suggesting a link farm or redirection strategy. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a deceptive link 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.ru/pify?keyword=50+challenging+algebra+problems+fully+solved+pdf
    • http://files.flymusic.studio/uploads/1/3/0/8/130873804/43fbc8febbf.pdf
    • http://files.mammothmoose.com/uploads/1/3/0/8/130874495/5815878.pdf
    • http://juvuxot.mistletoemagicartisanshow.com/uploads/1/3/1/6/131636664/dovemi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/alanbrooke_diaries.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/jekukesuduwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/56747972119.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nijudesiko.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/6384961540.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/mylab_and_mastering_oceanography.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/tusewuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/13116786750.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6175/files/93902336918.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/fajuzawomopimixex.pdf
    • https://cdn.shopify.com/s/files/1/0430/8697/1029/files/nimusolodumamavevo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e4.bin
96690072608c5a310b15c58e87c5d6cf53edb386ab405019eaac817552464100
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E4 5844 bytes
font_01_sfnt_off00007980.bin
5eec204b34c07c63068067250e9306fb7f15ddd043776faa46c1e14a01415d69
pdf-font-stream PDF embedded font (sfnt) at offset 0x7980 10452 bytes
font_02_sfnt_off00009d39.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D39 4324 bytes