Malicious PDF — malware analysis report

Static analysis result for SHA-256 6395ba441a346a23…

MALICIOUS

PDF

41.2 KB Created: 2020-08-25 17:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b60c14011b62cebae50fe3409d930f2a SHA-1: 7f308c9a5d9186ee52754e8e8fbe17d1ed06d4cf SHA-256: 6395ba441a346a23eb7cf46ecfcfd12d37251d12d8300511960cf12f72944a44
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is `https://ttraff.ru/pify?keyword=9v+alkaline+battery+datasheet`, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise its malicious nature. The ML classifier strongly supports the malicious verdict.

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=9v+alkaline+battery+datasheet
    • http://rejoz.thelivestocklounge.com/uploads/1/3/1/6/131637316/wozuwojomaxezibaden.pdf
    • http://files.asiabookcenter.com/uploads/1/3/0/8/130874012/vonigaledawuzu-fagomidowesakep-pekolovofediw-fuzokonuv.pdf
    • http://files.aloeverancl.com/uploads/1/3/0/7/130776386/4710619.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3175/4902/files/vafarowarovabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/all_my_loving_piano.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/intraday_liquidity_reporting_swift.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/fuwafupuxerod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/3994/files/gate_2020_questions_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/answer_tea_singapore_review.pdf
    • https://cdn.shopify.com/s/files/1/0434/6455/6710/files/bawozipesufevufapetageke.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/2013_nissan_rogue_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/fundamental_of_differential_equations_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/94688787362.pdf
    • https://cdn.shopify.com/s/files/1/0434/7687/7478/files/63280047253.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/alcoholism_project_download.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_off00006370.bin
e0b88436c6cd237ac06033cf6ef3a652a6f47a8f3edfeeb881139e383dd6045d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6370 5340 bytes
font_01_sfnt_off0000758e.bin
fe9bc53a0b61e434271e62af5aaf71b2ef0fc32474243cc41a38e112df964aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758E 10140 bytes

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