Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb8dfd58507df41…

MALICIOUS

PDF

37.3 KB Created: 2020-08-14 08:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3cd4049165289104247ddb6eeffeeb5 SHA-1: 7de1fdc4bc83ea690d0682f9ec6b3bc9b5254e80 SHA-256: abb8dfd58507df41dac7eeee29d2887b29b21c345429b9176b0e6baba6759ddb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a deceptive lure, presenting itself as a 'dimensional analysis chemistry worksheet with answers' to encourage users to click embedded links. The primary link, https://ttraff.ru/pify?keyword=dimensional+analysis+chemistry+worksheet+with+answers, is identified as a malicious redirector. The document also hosts a large number of other PDF links, many pointing to shopify.com, which is indicative of a link farm used for SEO poisoning or distributing further malicious content.

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=dimensional+analysis+chemistry+worksheet+with+answers
    • http://files.forzarealty.com/uploads/1/3/2/6/132680867/1041825.pdf
    • http://files.greatlakesfrequencies.com/uploads/1/3/2/3/132303278/5653909.pdf
    • http://files.hollywoodrobbie.com/uploads/1/3/1/0/131070604/1820455.pdf
    • https://cdn.shopify.com/s/files/1/0431/5738/9472/files/90547747306.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/kenep.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/1258810623.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3873/files/856792442.pdf
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/gepulepokonisosapusabetop.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/luxepidigudumikutoka.pdf
    • https://cdn.shopify.com/s/files/1/0432/9429/4171/files/wind_generator_project.pdf
    • https://cdn.shopify.com/s/files/1/0451/3647/8361/files/namakam_chamakam_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/70373264130.pdf
    • https://cdn.shopify.com/s/files/1/0436/2951/0814/files/scanshell_800nr_calibration_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/82120738337.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_off00004891.bin
3d94e04b25a55271faf24b56f4177492a90d462054d6584fd51909ee8e62a86e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4891 5084 bytes
font_01_sfnt_off000059b3.bin
1b582acaf2922797d05627c20baffcdb3b077b4e1f690ec9775657ca38ba63e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B3 9420 bytes
font_02_sfnt_off000079e6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E6 4324 bytes

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