Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb7c71be9b3b38d…

MALICIOUS

PDF

42.8 KB Created: 2020-08-28 02:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9b3217419f121ff43ef680ea4db8ce0 SHA-1: 6fde9c08c08a0383e2c1d9291fb0c8b1bf3707a8 SHA-256: dcb7c71be9b3b38dbeeb52d7b0af0b10684932818bc6d3f8ab96a0b2c299a53f
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised as a printer driver download. This is further supported by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics, indicating a deliberate attempt to host malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document body and heuristics clearly indicate a phishing lure.

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=epson+artisan+725+printer+driver+for+mac
    • http://fezalev.stressfreefurniture.co.nz/uploads/1/3/0/8/130874388/fakunubiriwudasuzamo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/letufawan.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/xedimodituzuvufelos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/carga_electrica_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0437/3187/8049/files/mapa_antiguo_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/57926664796.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8044/files/95058399235.pdf
    • https://cdn.shopify.com/s/files/1/0446/3493/1363/files/1420322855.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/a_twist_of_the_wrist_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2063/files/butedojeliralajizenek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81579197248.pdf
    • https://cdn.shopify.com/s/files/1/0436/9226/1529/files/new_bhajan_video_mp4.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_off00006862.bin
9690a33d542f6bcb3eee0fa9f6cf00f2cf3ad904a0ac72309e138ebc1df2ed65
pdf-font-stream PDF embedded font (sfnt) at offset 0x6862 5624 bytes
font_01_sfnt_off00007b76.bin
7513c230d351c3c8cbc5882e3c4146dec8a59b301d6d3f7a87b640626659344a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B76 10204 bytes