Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9ffc52c5e462ea…

MALICIOUS

PDF

55.7 KB Created: 2020-08-23 04:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebfb541506ecbb7fd1f67b7939aa002f SHA-1: ff7de0b4516f06204d5b121a785e72fc040b7f18 SHA-256: 0b9ffc52c5e462ea728149bdc6ac4080a9eb3f4a011a5ac6ceeeba24f069bd73
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous links, many pointing to shopify.com, suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=warship+battle+game+for+pc
    • http://files.laurawebber.com/uploads/1/3/1/8/131871484/zivoxeferir.pdf
    • http://zunopat.jenniferborkowskidesigns.com/uploads/1/3/0/7/130775166/c18e5453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/0489/8978/files/walking_dead_minecraft_servers.pdf
    • https://cdn.shopify.com/s/files/1/0436/1669/8526/files/mawigutilabisowezaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/pipeputoretesurozakovu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/d_d_book_of_vile_darkness.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/fanarum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/fumebaxalibalarejum.pdf
    • https://cdn.shopify.com/s/files/1/0437/2486/5685/files/jajotivimuwinuwi.pdf
    • https://cdn.shopify.com/s/files/1/0462/0910/6073/files/7567401728.pdf
    • https://cdn.shopify.com/s/files/1/0430/3260/8921/files/68625819449.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/55378063884.pdf
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/20087571459.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/5602257643.pdf
    • https://cdn.shopify.com/s/files/1/0436/2082/7300/files/ketimesedogonorepixusogo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009bad.bin
83dc4c935aedbcc16d8f7b2ce75bf0eb40f05f9b495ef3219f234a203783b6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAD 5580 bytes
font_01_sfnt_off0000ae91.bin
7be9ed06eef79583740e9741b615cab2ca6beb8f9d4b5acad9c1dc870393fa8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE91 10420 bytes

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