Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6c4ee8ae497d21…

MALICIOUS

PDF

58.5 KB Created: 2020-08-05 23:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28919e4f049e1d93bfc543f7c9ac2d2b SHA-1: 53d0590d18ad11b255152d8067b9ec8838be1865 SHA-256: ec6c4ee8ae497d2188450b1fde6a7d404a58c296000fc65137f76fb03ecb23f9
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link. The embedded URL 'https://ttraff.ru/pify?keyword=l+etranger+albert+camus+pdf+english' is a known malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, including one pointing to a Shopify domain which is also a known malicious redirector. The document body contains obfuscated text and metadata suggesting it's designed to appear as a search result or document link.

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=l+etranger+albert+camus+pdf+english
    • http://files.creativesoutherndesigns.com/uploads/1/3/2/8/132815924/dazogumexu-gamam-digeko-jonadane.pdf
    • http://files.nourishdiy.com/uploads/1/3/2/6/132695575/voxogemabifete.pdf
    • http://files.ptlg.net/uploads/1/3/0/7/130775197/mipanizigufazomemap.pdf
    • http://vinipe.michiganskymedia.com/uploads/1/3/0/8/130874330/nibinitezesokakijopa.pdf
    • http://rixaxok.hvaillancourt.com/uploads/1/3/2/6/132680813/dinukobu-lopeba.pdf
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/80051669151.pdf
    • https://cdn.shopify.com/s/files/1/0443/8127/4278/files/lausd_web_filter.pdf
    • https://cdn.shopify.com/s/files/1/0431/1475/8293/files/vamiputajujalexozupufokuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/8605/3527/files/24262279827.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/nutibovesivaxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9853/8151/files/translate_arabic_file_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/4371/5229/files/11798743864.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/dixivarolepep.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/58319650406.pdf
    • https://cdn.shopify.com/s/files/1/0435/1072/6815/files/58572572066.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4933/files/invitation_to_the_lifespan.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_off00009085.bin
8611276c5d3c0973527e4929c8e1189519eb5e1950ce17b229b652105e7c4e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9085 5652 bytes
font_01_sfnt_off0000a393.bin
ffe6439852317c9aea510c8373f611b1df73b7a108c7d28610c040f55300dfab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA393 10560 bytes
font_02_sfnt_off0000c7ad.bin
e5355abaff8fcab33ce34e55931ff21a393705a3507c9049660e5b960e5a87d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 16100 bytes

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