Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b4aa8adcad0d81…

MALICIOUS

PDF

40.7 KB Created: 2020-08-22 15:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89bbc88b2434e94add1608a1a9e7bcf3 SHA-1: a1b900429ceb839227c4356bd0f0423b428c046b SHA-256: 64b4aa8adcad0d814709deeb641533bbde40124e206fb2a453cbc286b173685b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, includes a URL that appears to be the primary lure. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, further indicating malicious intent.

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/pify?keyword=bluecoat+6th+form+open+evening
    • http://kumabud.lmbgroupllc.com/uploads/1/3/0/8/130814179/65702c8b.pdf
    • http://zazojogi.midwestfilmfactory.com/uploads/1/3/1/4/131453247/boduj-lezewof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4379/9719/files/47656317493.pdf
    • https://cdn.shopify.com/s/files/1/0437/3502/3770/files/mazemomofotaberojenene.pdf
    • https://cdn.shopify.com/s/files/1/0439/1151/2232/files/pegajeramuza.pdf
    • https://cdn.shopify.com/s/files/1/0435/3117/4039/files/32357656942.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/introduction_to_calculus_and_analysis_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/zupatejizokefaxanujap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/29449171590.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdf
    • https://cdn.shopify.com/s/files/1/0429/9934/9407/files/philadelphia_street_map.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/formal_language_and_automata_theory_download.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_off00006015.bin
9c96e1afa1c9b77b50a3ce287a93ba84983e7987ae39a8b8b8c295c83062b06c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 5512 bytes
font_01_sfnt_off000072b5.bin
3431d22cdc5ced749d0ea33b9b6396a891468896a2119b3570f15e6d81146e9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B5 10316 bytes