Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e1db9182136cd0…

MALICIOUS

PDF

37.2 KB Created: 2020-08-09 03:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97f34b4e5c16f48ba0d745809bd564f9 SHA-1: 24be30ee130bf861189dac17bd4aaac31de9d578 SHA-256: 84e1db9182136cd0207f116d89ce1048eb2f0c92580780205511f67141150402
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to external content. The ML classifier strongly indicates maliciousness, and the presence of multiple PDF links points to a link farm strategy.

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=introduction+to+forensic+anthropology+pdf
    • http://files.elizabethbernays.com/uploads/1/3/1/4/131483266/f27bf3899.pdf
    • http://files.norcalsmartvestorpro.com/uploads/1/3/2/7/132710655/96f0fa3.pdf
    • http://files.delsurvey.com/uploads/1/3/1/4/131437883/bevaki.pdf
    • http://dotevupij.maplegroveumciowa.com/uploads/1/3/1/4/131482995/texidusenatuxoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/25749629261.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/wijisaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/vugufatekefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6444/files/widonitopaloleb.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2783/files/australia_political_map_blank.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/6877055109.pdf
    • https://cdn.shopify.com/s/files/1/0438/3352/4386/files/lovufo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/95807327090.pdf
    • https://cdn.shopify.com/s/files/1/0432/1204/6495/files/calicut_university_bsc_computer_science_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/33510170555.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/19691151308.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/automatisme_informatique_industrielle.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_off00005279.bin
3d8873e2e1de0057e021fdaa393ee077bbd30261726d5c926187cba2d4b90ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5279 5456 bytes
font_01_sfnt_off00006510.bin
58fb788d5eafe3c38c09f499037db7fa3208671cc4e94f1af923ec2215a52ac5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6510 10212 bytes