Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f10eea939bf4294…

MALICIOUS

PDF

51.0 KB Created: 2020-08-30 20:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08b327a0e97b36854e97e4dcfc036e0a SHA-1: d4de9ae3c935c4bf49e2b82810773097c62917d9 SHA-256: 6f10eea939bf429403d61a113318fd7680d6942812b7b0cbfe07bde96760d4b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector URL. The document body, though heavily obfuscated, contains a reference to 'Sap for beginners' and the malicious URL, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent to redirect users.

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.com/wix?keyword=sap+for+beginners
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d3758e_fdbb596feaae4b9d8f36d3ab227047a3.pdf
    • https://static.usrfiles.com/ugd/930050_ad2c1a72369f4db18f03fdb2f4617a40.pdf
    • https://static.usrfiles.com/ugd/b8c837_21ad8ac7d4304e9da264adf9cb0aa49b.pdf
    • https://static.usrfiles.com/ugd/c068f8_b5a9cbd2896749deb299591e99b2a1b4.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/99835521421.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/protective_relaying_theory_and_appli.pdf
    • https://cdn.shopify.com/s/files/1/0440/3753/7942/files/34861514060.pdf
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/70024421847.pdf
    • https://cdn.shopify.com/s/files/1/0439/7786/7422/files/27021539134.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/sugonejidopalil.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/escaping_the_giant_wave_audio.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/face_recognition_system.pdf
    • https://cdn.shopify.com/s/files/1/0437/4485/4165/files/gebani.pdf
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/kimodinexosidemewizukaf.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_off00008395.bin
e48f633921717a2addba4f5012631949a483f40fec0028270fb51028f1a35454
pdf-font-stream PDF embedded font (sfnt) at offset 0x8395 5280 bytes
font_01_sfnt_off00009594.bin
f408202da8906b85483cb20ca238aff1a288b3313bb0255c458035bece1cd609
pdf-font-stream PDF embedded font (sfnt) at offset 0x9594 12952 bytes