Malicious PDF — malware analysis report

Static analysis result for SHA-256 739798698b2cd7a4…

MALICIOUS

PDF

51.4 KB Created: 2020-07-24 16:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a0c91d7878c92db21d040ceb9773fc6 SHA-1: 6ad79c75396755acd6f8153803c6818ee42051ff SHA-256: 739798698b2cd7a456bebb5ef99ba74bd1787a9282bbdcbab98329700deb81bc
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector infrastructure. The presence of a 'download button' lure further supports the malicious intent, aiming to trick users into navigating to the compromised URL.

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.ru/pify?keyword=korean+learning+book+pdf+free
    • http://files.firstclassathletics.com/uploads/1/3/2/6/132695732/xapatada_bopisojuwokusuw_nanop.pdf
    • http://files.redpointfitness.net/uploads/1/3/0/9/130969260/1699870b.pdf
    • http://files.dennishorseshoes.com/uploads/1/3/0/9/130969855/03d586.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/dafel.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/wotupediwokamidikij.pdf
    • https://cdn.shopify.com/s/files/1/0432/1234/1416/files/35915290699.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/fadatotema.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/zukatogotelenofurodofodu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9729/9869/files/19070735872.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/49462742460.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/tadigokola.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/pemen.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4503/files/nudilar.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_off00007c83.bin
98eaf88306adfb563c6f76a6a6bcf3b76e4e26d791b6dfae82d739d30e7260fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C83 4916 bytes
font_01_sfnt_off00008d8c.bin
45b8d90958b5477712a07b9d58e9362c5c9d8bd134e206e6b164cdaf07ca8bd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8C 4912 bytes
font_02_sfnt_off00009e3d.bin
2f51a0ecb1ef9664d853d63a73dd4ab4ad3bb6ab3330b43d103a4893e404bcf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E3D 9996 bytes

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