Malicious PDF — malware analysis report

Static analysis result for SHA-256 677d961bc3b2db36…

MALICIOUS

PDF

42.2 KB Created: 2020-08-13 07:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b8056c2567667eb42b87aca5e5cee8b SHA-1: 38fd19fa697a9c47bf75399c0208c176055960d8 SHA-256: 677d961bc3b2db36fd58283fed72d7d78aa0981e530230054b5c7bae75621ca2
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a redirector service. The primary malicious link identified is https://ttraff.ru/wb?keyword=concepto%20de%20episiotomia%20y%20episiorrafia%20pdf, which is flagged as malicious. The document's structure suggests it is part of a link farm designed to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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/wb?keyword=concepto%20de%20episiotomia%20y%20episiorrafia%20pdf
    • http://files.elmtreehome.com/uploads/1/3/1/6/131606431/vibituwinotodi.pdf
    • http://files.daniellebschwartz.com/uploads/1/3/1/6/131607103/gonudaseparos-leburasovo.pdf
    • http://kinipotu.thadwester.com/uploads/1/3/0/8/130874284/ec35f6714.pdf
    • http://pojijeki.sv-integrity.com/uploads/1/3/0/7/130776757/lamusezubid.pdf
    • http://files.mindthestep.nl/uploads/1/3/0/7/130776386/3f04d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0453/5566/3515/files/gametogenesis_pada_tumbuhan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/51893787139.pdf
    • https://cdn.shopify.com/s/files/1/0436/5477/4949/files/little_book_of_currency_trading.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3688/files/spelling_bee_grade_7_word_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/mercruiser_350_mag_mpi_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6917/files/tutorial_de_ableton_live_9_en_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0437/1080/8216/files/ninuvixotadar.pdf
    • https://cdn.shopify.com/s/files/1/0433/3751/5176/files/reality_therapy_william_glasser.pdf
    • https://cdn.shopify.com/s/files/1/0433/9692/3555/files/uji_alkalinitas_gelas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/dugozapuxadusasopusima.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/36056663477.pdf
    • https://cdn.shopify.com/s/files/1/0433/6189/4565/files/65329641944.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/absolute_advantage_vs_comparative_advantage_example.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_off000066b1.bin
9067e4d151aad949dee64065745d653c5c9f1366f69d17523ba723747bc31f83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B1 5276 bytes
font_01_sfnt_off0000788a.bin
2bdf7f06460bc9777fc56148fc7b711a0a9df062ff4294249fd5ccc54f7cc45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788A 10220 bytes

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