Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3c584a3eb4d6ce…

MALICIOUS

PDF

34.9 KB Created: 2020-08-11 21:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dfdebc35dd564b71b777edc60494dbc SHA-1: c60280e532b22494509950956ec948607c4f6b13 SHA-256: bd3c584a3eb4d6ceed73910a50e43a5ec60630604c97e5cbb35ee2b889285fe0
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) that is known to host malicious content. The document body itself contains obfuscated text and URLs, further supporting the malicious intent. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector usage are strong indicators of a phishing or malware delivery attempt.

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=alconox+msds+pdf
    • http://files.kcpcnlnh.com/uploads/1/3/1/8/131856318/d9ec2de.pdf
    • http://files.rebuildersspecialty.com/uploads/1/3/0/7/130776795/7ef163.pdf
    • http://files.thedayindayout.com/uploads/1/3/1/8/131856212/foguvujexaweri.pdf
    • http://files.profiperformance.com/uploads/1/3/0/7/130775732/siratal.pdf
    • http://files.andrewwarnerdogtraining.com/uploads/1/3/1/3/131380915/kodoton_wamewulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/tutegelojopekufeko.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/monibide.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/shoprider_scooter_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3040/4506/files/damesawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/developing_country_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/ziwenopanefasanidagedi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/42398242861.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2406/files/magic_chef_dehydrator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/4760/6679/files/heidi_przybyla_wikipedia.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_off00004b95.bin
1cce7b0fa40d1177b91b2160964c3455368ff5860ba2ef248722b681ca132d9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B95 5052 bytes
font_01_sfnt_off00005cb7.bin
442298244e2df33cc1b18a35f11bb449bfc78be1d35eed163508596f6453f874
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB7 10036 bytes