Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef42d58fcd3b8d4…

MALICIOUS

PDF

70.0 KB Created: 2020-07-29 23:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2658f3ab57e2d65dc64d852af1d6d45 SHA-1: d81027311a0b4236a21ff6a0891b39a373e1328e SHA-256: 0ef42d58fcd3b8d43008b2947211b05f9de6123c05b8d44b13e2c387adc06e1f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a clinical case study. The presence of many external PDF links indicates a link farm or a mechanism for 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=caso+clinico+agorafobia+pdf
    • http://files.dbtfamilyskills.com/uploads/1/3/2/8/132814387/getebir.pdf
    • http://files.angelasteinmann.com/uploads/1/3/2/6/132695571/mujenapejer.pdf
    • http://files.jeremywest.co.uk/uploads/1/3/0/9/130969748/bitej.pdf
    • http://files.tacomansd.com/uploads/1/3/1/4/131437445/raguxofuwusode-kizugemin-renewiluderawef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56966684837.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/najasunomagekorifogomine.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/19774552695.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2767/files/limifig.pdf
    • https://cdn.shopify.com/s/files/1/0433/8683/0998/files/zuzefekigiritaxuke.pdf
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/figalujujoguni.pdf
    • https://cdn.shopify.com/s/files/1/0429/0697/6422/files/zovusabezeloxip.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3992/files/7054751498.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5552762143.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/mazexaju.pdf
    • https://cdn.shopify.com/s/files/1/0431/9903/7595/files/33928018278.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64238793182.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/86734686681.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/wijosurakuterekowizeruja.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d25f.bin
ca8b7269981868dae0a9fc5dc71f0083a4b7eb429649b07b4a623d809b545e69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 5076 bytes
font_01_sfnt_off0000e391.bin
8ca0acc1cf933214634cc887bd18aac4fd94e7d78216f4f3cdbe2ded5dbf6ca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 11600 bytes

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