Malicious PDF — malware analysis report

Static analysis result for SHA-256 28800a2c9fe9c904…

MALICIOUS

PDF

45.2 KB Created: 2020-08-06 06:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07adf93cabb1a517eb197d7f2720a71f SHA-1: d999763b75c43840cb46748c614d5a74d599680c SHA-256: 28800a2c9fe9c9041ba363ed9d06b46426775a1cc5d277a446aa4ecfe7181fb4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector (ttraff.ru). The ML classifier strongly flagged this PDF as malicious. The presence of a large number of external links, many pointing to Shopify-hosted PDFs, suggests a link farm or SEO poisoning tactic to lure victims. The document body contains garbled text but includes the malicious redirector URL and a benign-looking PDF filename, reinforcing the redirection attack pattern.

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=bgp+pdf+router+alley
    • http://files.makinghairsmile.com/uploads/1/3/1/4/131438557/jitukire.pdf
    • http://files.thinkerslodgehistories.com/uploads/1/3/0/7/130738566/wobijibajefun_dotor_tonirufojutejiz_daxik.pdf
    • http://files.aauindiana.com/uploads/1/3/1/6/131637362/vaben.pdf
    • http://files.madeinoak.com/uploads/1/3/2/7/132712661/sigilufux-fezemibapamo-voviwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/electronic_principles.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/zopejedorexosel.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/how_to_exit_nano.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/wasugup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/mewikerimogaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/anaerobic_digester_design_calculations.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/caderno_caligrafia_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/zazitademusi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0695/files/25465446654.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/44118272899.pdf
    • https://cdn.shopify.com/s/files/1/0437/0599/1322/files/tim_bolen_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/ubuntu_l2tp_server.pdf
    • https://cdn.shopify.com/s/files/1/0429/6533/6217/files/online_buying_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/77020719383.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_off00006773.bin
bbe9394ad4270fceee6f0c2e536675c7f8308b59c0e27726c49da4d7cca63433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6773 5184 bytes
font_01_sfnt_off0000793a.bin
b53c9692e9b5d9247af9ec3cb77122f866c1a7f3ac99403b240c59e2fbb2d3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x793A 15020 bytes

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