Malicious PDF — malware analysis report

Static analysis result for SHA-256 8584b6d30c3bed34…

MALICIOUS

PDF

49.5 KB Created: 2020-08-09 07:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38908f10373aa72bb9cbdc32993b2a88 SHA-1: 4e58a564e6648f8c440afdc329d4be9997b60171 SHA-256: 8584b6d30c3bed3498a627858b13c488b01f495e247550e0e42ed07bceec8dc8
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, many of which point to a link farm designed to host PDF files. One prominent link, disguised as a book download, redirects to a malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure is indicative of a link-based redirection attack. No scripts were extracted, but the embedded URLs and link farm structure suggest a phishing or redirection attempt.

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.com/pify?keyword=electronics+engineering+book+pdf+download
    • http://files.pennyquartet.com/uploads/1/3/0/7/130775017/xinanewu_suwedowezelepur.pdf
    • http://dedog.taracarpenterart.com/uploads/1/3/0/9/130969204/kamili.pdf
    • http://files.whiteroseartstudio.com/uploads/1/3/0/8/130813314/1195778.pdf
    • http://files.giantequipmentsales.ca/uploads/1/3/0/7/130776143/36a760b5d504.pdf
    • http://files.mrpeebs.com/uploads/1/3/1/4/131408153/mekewej-mebugimisepa-lesaxulev-gopukarujawer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8937/9996/files/fekebijev.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/kovazewexotifepedo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/80742449218.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5290/files/riger.pdf
    • https://cdn.shopify.com/s/files/1/0437/6395/7909/files/32865015629.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/45374507832.pdf
    • https://cdn.shopify.com/s/files/1/0434/7081/5397/files/23139531436.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/paloxavisubevoxilemodab.pdf
    • https://cdn.shopify.com/s/files/1/0432/8564/3420/files/the_prize_julie_garwood.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.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_off000078a2.bin
bb89f1be23a485b2019787b1d26be539536b9c90f1e36b92fc5f533997f9bf29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A2 5576 bytes
font_01_sfnt_off00008bb3.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB3 2116 bytes
font_02_sfnt_off0000957d.bin
20590d6e1f952057ee5c31f6fd6232cbd1fbbec18c6c02a431720c92713ea7a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x957D 10316 bytes

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