Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea13f570c0b1bed0…

MALICIOUS

PDF

34.5 KB Created: 2020-08-25 01:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25042ea6c601467435ea051fb089ed86 SHA-1: e1effbe26c62d19c36763db180ab7ba8e524753a SHA-256: ea13f570c0b1bed0db5c5dca85a06170a1d8ec9187ef4bc904ac3625c0c508ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body, though partially corrupted, suggests a lure related to "Frca short answer questions" to entice users to click the malicious links. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.com/pify?keyword=frca+short+answer+questions
    • http://files.cuddlekidshome.com/uploads/1/3/1/3/131380263/miber_jelisinoxem_raxovikelubow_juwofof.pdf
    • http://vurutuz.dbyj.com/uploads/1/3/2/6/132683003/pogalete.pdf
    • http://maburuwud.edyspsds.com/uploads/1/3/1/3/131381006/lirijewutoriz.pdf
    • http://files.centerformarxisteducation.org/uploads/1/3/1/6/131636651/rebisodafakota-rokabidewi-bojolipizes.pdf
    • http://supaxup.cathrynweissportfolio.com/uploads/1/3/2/7/132740718/jaledalobowoxu-gazul-biwidafaw-zadujisakifux.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/22958050219.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/binary_search_algorithm_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/3812/1895/files/64456830948.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/80563438235.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8072/files/82606920390.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/xaburozemodegifikumupa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7506/6273/files/noxiwoxonebapin.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9803/files/facebook_business_manager_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/1800/9250/files/sibezelilerataw.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/formal_apology_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/35000248052.pdf
    • https://cdn.shopify.com/s/files/1/0439/4670/5051/files/74326273557.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c57.bin
07527055a0543087794b912498ca4e4dfa0fb2e8f0242f901d6b66c44ac42867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C57 5028 bytes
font_01_sfnt_off00005d7f.bin
763ff4f9bc901602124a3935c13eafa7b567b7b2c98643486a9d8a314c8ce2d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7F 9288 bytes

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