Malicious PDF — malware analysis report

Static analysis result for SHA-256 682eb39f11309ba4…

MALICIOUS

PDF

40.6 KB Created: 2020-08-18 22:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c751f291f31efe2262338d989e907e84 SHA-1: a39aff5c97e07db97719577a42afdee13385fd9c SHA-256: 682eb39f11309ba434fe929a52416176f1f193fb28d9890b730e680a41a9f881
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, creating a link farm. One of these links, https://ttraff.ru/pify?keyword=functional+specification+document+format, is identified as a malicious redirector. The sample's primary function appears to be directing users to potentially malicious or unwanted content through this extensive link farm.

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=functional+specification+document+format
    • http://xogos.drosamasallam.com/uploads/1/3/1/3/131383813/zeposanoxijawulox.pdf
    • http://rujabeden.ccaaugusta.com/uploads/1/3/1/4/131452937/budazodozugo-pumowum-bezutum-bakafu.pdf
    • http://lidexa.dsmwoodwork.com/uploads/1/3/1/3/131381006/bikixizatiziju.pdf
    • http://files.radcliffchristianchurch.com/uploads/1/3/1/3/131384359/pomibawukube.pdf
    • http://nukezowid.supercoolyconcepts.com/uploads/1/3/1/4/131482995/lejiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/mebilo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/disokagubebuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/7522/3200/files/vatekukarejilo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/geankoplis_transport_processes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/daxazigefa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/20189204450.pdf
    • https://cdn.shopify.com/s/files/1/0439/0646/5947/files/pdf_to_word_mac_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6695/files/parent_functions_and_transformations.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/28022539016.pdf
    • https://cdn.shopify.com/s/files/1/0437/5828/9045/files/ultrasonic_flow_meter_calibration_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0549/files/minecraft_gas_station.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_off00005fd1.bin
2df40e36345cd56e2f703e1b146420b2a1d9c2f9caff20a1b154aec86aafad40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD1 5256 bytes
font_01_sfnt_off00007193.bin
05961827198bd5aa8bc2bd02c5ceea8e832f4c46703049d491433eba472ae506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7193 10476 bytes

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