Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1d296a9075211b…

MALICIOUS

PDF

48.9 KB Created: 2020-08-15 01:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdd8ce019b6d13e4fae5faeb16565043 SHA-1: a6205fae023cb8138312dbe250b8e8f3e775a136 SHA-256: 6f1d296a9075211bea86b056c7d6f59de38fa047ea946e6ce951de59cff8e11d
154 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous PDF files, with one primary URL pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the embedded URLs suggest an attempt to distribute further malicious content or phish users. The document body, though heavily obfuscated, contains the primary malicious 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.ru/pify?keyword=roman+soldier+breastplate+template
    • http://files.funwithalphabits.com/uploads/1/3/0/9/130969498/feruxudifij_dototanuwu.pdf
    • http://files.graywolfpestcontrol.ca/uploads/1/3/1/4/131409309/3779550.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/5654/6463/files/mefobogofidu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5441/files/zulumodod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/wepup.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/73423122689.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4454/files/physics_halliday_resnick_krane_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/2969/1558/files/dogominurajitodaridagidi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1401/9496/files/57268426254.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5879/files/juluwepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/behavioral_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9226/2560/files/cherenkov_radiation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0429/0917/1871/files/21138304520.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074d8.bin
e45ede3fcc02deb8d4c98291214ec1f9ce703010b86c0f2b6a11488d7c70e81f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D8 5040 bytes
font_01_sfnt_off000085cd.bin
f55210e05af0c410edfdebe26376b48fd533fe9df4bd785782dfe9945b09064c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85CD 10048 bytes
font_02_sfnt_off0000a83e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA83E 4324 bytes

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