Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca9ef5f82fa1d63…

MALICIOUS

PDF

58.0 KB Created: 2020-08-16 21:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3977c30c96a12afc11cd410d162e07d SHA-1: 34ce1c16d8edf7a4649fc632c14f9649633a1dd1 SHA-256: fca9ef5f82fa1d6350edc173e696838b2c053e8aa9c82f8eb83d6331f7d587ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm, embedding numerous links to other PDF documents. One of these links, 'https://ttraff.ru/pify?keyword=biografia+anisio+teixeira+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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=biografia+anisio+teixeira+pdf
    • http://lodiveg.edible-s.com/uploads/1/3/0/7/130776167/fabakesa.pdf
    • http://gisenami.knutsonresidentialdesign.com/uploads/1/3/2/8/132816202/7945010.pdf
    • http://zezal.rockrivertownship.org/uploads/1/3/2/7/132740649/lidagipupakibise.pdf
    • http://files.outspire.com/uploads/1/3/2/6/132680962/gimal-dojekawuw-sinekekaneg-ginoba.pdf
    • http://files.growwithease.com/uploads/1/3/1/3/131379591/masazeseno-modixet-jonixemagu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/advanced_learners_oxford_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/13729927598.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/zibiluvuvedodomow.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3414/files/budapest_metro_map_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vidabuvuwegorowomilamum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/sojatisirabex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/mesuxejufegokixu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/nufunew.pdf
    • https://cdn.shopify.com/s/files/1/0434/4230/7239/files/loliburafibuzeneg.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/87295666582.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/88570668720.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/boss_katana_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84712881745.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/jeremy_bentham_utilitarianism.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/20069445468.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000096a5.bin
102e5be69d1f273ca7b88cf7c83a690ac49fd5c2f85087cf730d55f85d296457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A5 5296 bytes
font_01_sfnt_off0000a8af.bin
6a77f955d39b9d81e75477a2b3a68a06f90d7b352a411c8fd057aba46c531b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8AF 2236 bytes
font_02_sfnt_off0000b2c6.bin
294ea398efffd8bdc235d1b0e8792d9ce731166d83ff7ff7eaa4cd59c4a7b7dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C6 12564 bytes

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