Malicious PDF — malware analysis report

Static analysis result for SHA-256 79688407f67854ef…

MALICIOUS

PDF

81.1 KB Created: 2020-08-11 06:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e01f9e3251f16b4d18c089fe6edbe53e SHA-1: 0f91d131d16e47677c30846d42cbac34ad872a4d SHA-256: 79688407f67854efc766d9e19db1de7b8291331d8e2b93fe64e6b91da4fec7d5
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a direct link to a known malicious redirector, ttraff.com, which is designed to lead users to harmful content. The ML classifier also strongly indicated maliciousness.

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=clustering+techniques+pdf
    • http://files.gunbarrelquiltersguild.org/uploads/1/3/1/8/131871462/wunaligadoxen.pdf
    • http://files.iansstories.com/uploads/1/3/1/6/131606366/9263157.pdf
    • http://files.rasigsassociationnsw.org/uploads/1/3/1/4/131407406/dipudusunu.pdf
    • http://files.myseattleblog.com/uploads/1/3/1/4/131407214/mefanu.pdf
    • http://files.rebuildhopekansas.org/uploads/1/3/1/6/131637047/5633b8a34652d8d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/4503541841.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6042/files/76937480860.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/jiledijipinavaxolaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/7298/7046/files/21309531743.pdf
    • https://cdn.shopify.com/s/files/1/0436/5526/6457/files/katemejitomumitu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9625/1304/files/fudasagenedewesuzuzirim.pdf
    • https://cdn.shopify.com/s/files/1/0431/1026/9085/files/dozusoreseripo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9585/files/coordinator_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0434/2582/4929/files/timespace_orb_pixelmon.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/nimodoget.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9648/files/livojimulola.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_off0000f33a.bin
b3221454fb35f578ac6ac6cba7e63318a290d27bbbd978fe507f7d502838acf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 5128 bytes
font_01_sfnt_off00010496.bin
9573115dd2f21b5e831699bc7b8694125d6feb453243be417eb3d467b3cbe9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 10780 bytes
font_02_sfnt_off00012956.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 4324 bytes

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