Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58258f39ea04e55…

MALICIOUS

PDF

41.9 KB Created: 2020-08-17 15:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f856b753c98d8e0bdb632051f1b45849 SHA-1: ed86dad3de68ec0bd9be40a9b732149be6554547 SHA-256: b58258f39ea04e55450dea98a7bc17e8a1ae2414341f6d00c164360b9d87f558
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass of external links, many pointing to domains that host PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used in conjunction with a lure related to bypassing FRP on Android devices. The document body, though heavily obfuscated, contains the same URL and keywords, reinforcing the malicious intent. No scripts were extracted, but the presence of a malicious redirector and a large number of outbound links indicates a likely phishing or malware distribution attempt.

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=bypass+frp+apk
    • http://files.exsanguinationsignet.com/uploads/1/3/0/7/130740618/gakusive_japawefirejo.pdf
    • http://files.keystonecrossingassociation.com/uploads/1/3/1/3/131398091/remibo-depagu-todinudof.pdf
    • http://files.innovativepossibilities.org/uploads/1/3/1/4/131453036/1483904.pdf
    • http://files.musicconnectionsministry.com/uploads/1/3/1/4/131406140/2979464.pdf
    • http://wamezukeb.pauljay-phd.com/uploads/1/3/1/4/131438641/107964de282b17.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/12378004308.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/lixolokilozamitilam.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/18893643172.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23313492251.pdf
    • https://cdn.shopify.com/s/files/1/0434/1032/5671/files/chemistry_practical_book_for_bsc_1st_year.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/benefits_of_integrating_technology_in_the_classroom.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/40010120655.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/repinisujutolit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8992/8096/files/kelvinator_de_ville_oven_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/20791736020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/memubenejal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000546c.bin
e2e161807b4f7e2531ab4e2f1f738269b6b1b884c5a4e34d4619703929f80453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x546C 5076 bytes
font_01_sfnt_off000065ce.bin
66dca5db926608d430e841a28176dd7d74484fed56e02204773c9f935856c731		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CE 9408 bytes
font_02_sfnt_off0000861b.bin
c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x861B 16092 bytes

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