Malicious PDF — malware analysis report

Static analysis result for SHA-256 67aff24011e87bd1…

MALICIOUS

PDF

52.6 KB Created: 2020-07-29 05:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae0728b0c545bc67964c247cd6a26495 SHA-1: 25c4bf2c4517bc166ea7e402f177f3ff0c13906c SHA-256: 67aff24011e87bd164be857359a522c13eafd7a4e6a1c8f6556c7bb0a84a8e17
154 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with a critical heuristic identifying a redirector link to 'ttraff.ru'. The document body, though heavily obfuscated, suggests a lure related to 'burrito bowl nutrition information'. The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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.ru/pify?keyword=burrito+bowl+nutrition+information
    • http://files.soifersmith.com/uploads/1/3/1/6/131636728/1b8826f6e9ecadc.pdf
    • http://files.weskinpsych.ca/uploads/1/3/1/3/131384208/277385.pdf
    • http://files.dubaiactivelife.com/uploads/1/3/1/4/131406269/6b369259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/pofagikuviwawuderokewaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4029/3543/files/23591288320.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/17530375881.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/fogaxi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/79017436054.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/72307939580.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesani.pdf
    • https://cdn.shopify.com/s/files/1/0431/7433/0517/files/lulesadorudarikedubev.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/51300552847.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/79576494092.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/tojivadifasawukubiterudo.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_off0000847d.bin
ad6bb7e9ce8d6d1f8873061c94313fcb0a857c359db3229915b70a4939558718
pdf-font-stream PDF embedded font (sfnt) at offset 0x847D 4780 bytes
font_01_sfnt_off000094aa.bin
809f91fc2a2460bcbaee9e0932d1601f26494657f7ed0f3eaef5e2bee1ccfc05
pdf-font-stream PDF embedded font (sfnt) at offset 0x94AA 15972 bytes