Malicious PDF — malware analysis report

Static analysis result for SHA-256 860a7611293f554e…

MALICIOUS

PDF

33.9 KB Created: 2020-09-08 22:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 27602191ed71908d47e953eac2f13a43 SHA-1: e7d74455d795a5ac2ff86df14dc35f3a1fa3c123 SHA-256: 860a7611293f554e778ff79abd01456c7f5df8398d06c11cfe0ac29f4c2b6587
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=comethazine+bawskee+2++zip'. Additionally, it exhibits a PDF link farm heuristic, with numerous external PDF links, many of which are benign but serve to obscure the malicious intent. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector and a link farm suggests an attempt to lead the user to a malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=comethazine+bawskee+2++zip In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/9f2514_b7b583c6deaa404ba97cb65b77be2869.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e6e573_51926e31636149e59a49b6ae4673490b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d31907_cb9fd8449efd48f6b5a37c05c8ea0d82.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c5d40f_f4e34ddb958e44c5be20c152b22b22c3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f515ca_9248fefc8d004a13b851b5b1ab3ded09.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/85d67f_c902aad562f64023866d79dda67b71cb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/54b9a1_ae761629c2d84547b97924c1f60adc2d.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/3498/4857/files/widimovilodanu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9124/4696/files/transworld_snowboarding_buyers_guide_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/dempsters_hamburger_bun_nutrition_information.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/namidukurotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/70955101773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/cancionero_con_acordes_para_guitarra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5217/0406/files/capteur_de_pression_d_huile.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4687 5312 bytes
SHA-256: 08dad221e7cd0a8f9628a82b301c75327bdad2b2a072c4144f4a9aa815c66a9e
font_01_sfnt_off00005887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5887 10068 bytes
SHA-256: fbebe2242a5367c64f8003d72845be78950502f360a8ab3c8feb889a12a5e469

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