Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c86b1df83756a6a…

MALICIOUS

PDF

55.2 KB Created: 2020-08-18 23:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80e0ca18cc62e604564592004ab68f05 SHA-1: 2837077a8280089a023905592eb2836a884daf03 SHA-256: 5c86b1df83756a6a85c63c6f4dc4a9d3ccdd64db38a32210d4165c0ef21a7967
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and the presence of numerous external PDF links suggests a link farm for SEO manipulation or traffic generation. The ML classifier also strongly flagged this PDF as malicious.

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=marketing+strategy+report+assignment
    • http://files.onsfbay.com/uploads/1/3/1/0/131070375/3215495.pdf
    • http://wabej.fbcgodfrey.org/uploads/1/3/0/9/130969465/a6112.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/bitdefender_antivirus_premium_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/setesixa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3380/files/bacteriology_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/5261/4311/files/bonomakidubanavedunade.pdf
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/beam_column_base_plate_design_lrfd_method.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/xenomanezumegefofepexatik.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/dikugezirexewulemabezum.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/didapotajadul.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/pidunepekuvanidu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/zexewulexunejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8461/1733/files/jugesepirekabukoseloval.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/92264329108.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d4a.bin
40c19c30a6b3011aae5e374d40e824db5da401e47a295cd1a449215742e007af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4A 5068 bytes
font_01_sfnt_off00009e76.bin
8c5f9d0923302de74c6262c68cd632cd231a3fca326e686ac2a38fe33c438796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E76 10272 bytes
font_02_sfnt_off0000c17a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC17A 4324 bytes

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