Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c93423b48ed30c4…

MALICIOUS

PDF

42.2 KB Created: 2020-08-01 21:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb85926bde9f7f503c98e9ef02012337 SHA-1: cd21596975b18a99314cf80d0dc66a7b9f808a0a SHA-256: 0c93423b48ed30c4f47d67d17df4eff434942a9c787fb13865b7b6ec28cfe99c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=watch+men+in+black+3'. This URL is embedded within the document body, suggesting a lure to trick users into clicking it. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier also strongly flagged this PDF as malicious.

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=watch+men+in+black+3
    • http://files.sems4acultureoflife.org/uploads/1/3/0/9/130969470/ropumaxin-devika.pdf
    • http://files.palumbofamilydentistry.com/uploads/1/3/2/6/132680986/32ccd4.pdf
    • http://files.barbrarian.com/uploads/1/3/1/6/131607063/e1ac2912.pdf
    • http://files.berrybrook.us/uploads/1/3/0/7/130739831/komajubenogajozo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/81612007167.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/57421676236.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/62425679879.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/rilopowof.pdf
    • https://cdn.shopify.com/s/files/1/0429/4819/8556/files/dogupokebomipitoxikano.pdf
    • https://cdn.shopify.com/s/files/1/0434/0187/1512/files/abm_piano_chord.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/xotenunasevirevupedu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/nexojed.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3777/files/gofixa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/nolubirafelof.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/52866914675.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/kosexodugazarizepupuletiw.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_off000066d4.bin
a0de5523b47ab175e9d633f661d4f51c9647fa89ebc3c2fbf184902672864bb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x66D4 5148 bytes
font_01_sfnt_off00007843.bin
eb885ab5db8eddebfc244adc7b828ed9ce01a3842e533f412b55bb2335cac4ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x7843 10380 bytes