Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9e5978c49904e8…

MALICIOUS

PDF

46.0 KB Created: 2020-08-21 03:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e522c48da774a4e86dc1eb043ed5c796 SHA-1: 8f3316baef7702df91fdc28a84cf59fbbf4df65c SHA-256: ed9e5978c49904e8d55719d88fab5ad0bad174503b2d09c9de6ce18f79e2bef7
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'Zenonia 4 leveling guide'. The presence of numerous external links, many pointing to Shopify domains hosting PDFs, suggests a link farm or SEO poisoning tactic to distribute malicious content. The primary malicious IOC is the redirector URL.

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=zenonia+4+leveling+guide
    • http://bezexi.paws4acauseinvitational.com/uploads/1/3/2/8/132814930/5236782.pdf
    • http://files.theaveragejose.ca/uploads/1/3/1/1/131163980/posalakatis-vinivukilosu-kapopu-fexumupurowalek.pdf
    • http://ruposit.miltonseacadets.com/uploads/1/3/2/8/132814930/5f91c546ec382a3.pdf
    • http://files.klinikjubilee.com/uploads/1/3/0/7/130739918/6b706eb.pdf
    • http://files.aceofdecks.com/uploads/1/3/2/7/132740352/maxovisexilodizolu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/39531997119.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/sowefanipevafawabipa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/blank_world_map_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/jepofijidegegiteweme.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/template_cv_format_word_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/43909962312.pdf
    • https://cdn.shopify.com/s/files/1/0433/8332/4822/files/eva_rubber_sheet_manufacturer_in_delhi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/dizedigejewuwojeki.pdf
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/beyond_the_sea_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6559/6321/files/43472294248.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/zotirisaderok.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_off00007767.bin
8a62fbaae75a63876a4791f4ff61f9a1a3b37d74bc2d74c098b4c38691271cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7767 4824 bytes
font_01_sfnt_off000087f1.bin
a5111189db1db894d5bd6d35dd7c13d3975698ac42db9f03c0c6ff1bf9c08be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F1 10460 bytes

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