Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4215cf1b36e518f…

MALICIOUS

PDF

37.5 KB Created: 2020-08-06 10:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d53625fd3e88dfc55317baa55e8df83e SHA-1: 0a476fad04fe9c72d7b9927baf99b057c6ffb279 SHA-256: b4215cf1b36e518f3c5bba341781c9bfaef21ac133f1cbb48233dc0457ece101
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF files, a technique often used for SEO poisoning or to obscure malicious content. One of the primary links points to a known malicious redirector, ttraff.cc, which is highly suspicious. The ML classifier also strongly indicated maliciousness. The document body itself appears to be obfuscated or corrupted text related to production and operations, likely a lure.

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.cc/pify?keyword=administra%25C3%25A7%25C3%25A3o+da+produ%25C3%25A7%25C3%25A3o+e+opera%25C3%25A7%25C3%25B5es+daniel+moreira+pdf
    • http://pariwodo.cfmmirrors.ca/uploads/1/3/0/7/130776208/wuvegupo.pdf
    • http://files.dallasclinicalpsychology.com/uploads/1/3/2/6/132681482/fuxozup_jixeruzodamozu.pdf
    • http://goduti.adviceandexperiencescheme.com/uploads/1/3/0/8/130814238/zegimubogi.pdf
    • http://files.gaiagraphics.co.uk/uploads/1/3/0/7/130740547/wovulubimozos-fefebakod-lowax.pdf
    • https://cdn.shopify.com/s/files/1/0434/5770/8193/files/pewarizoresawiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/5002/2550/files/67552330261.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/jupiwaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4683/8167/files/66823232405.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/97576344002.pdf
    • https://cdn.shopify.com/s/files/1/0435/9657/8975/files/simple_past_exercises_esl.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/65492748802.pdf
    • https://cdn.shopify.com/s/files/1/0436/4032/4256/files/54844208874.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/pavojefanekal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/dilokotibetanimegeni.pdf
    • https://cdn.shopify.com/s/files/1/0432/7001/3086/files/tuwukirigugovuveb.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_off00004d8f.bin
ee7fef8fe5d288a126c8ece4f1ada90f6bca3d1af099f81f9bfe2f296b5a8e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8F 5892 bytes
font_01_sfnt_off0000605f.bin
002a76302727417f0a012b121b0ad989c7ce2a02abc604b5f9eb275ee35678ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605F 12556 bytes

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