Malicious PDF — malware analysis report

Static analysis result for SHA-256 756a6841e346583c…

MALICIOUS

PDF

51.0 KB Created: 2020-08-13 09:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c08f0e8cc91ee773d2af1bae5248238e SHA-1: 2363d5c07d452178ca3d383628c8e8528beba971 SHA-256: 756a6841e346583cd8eb24f1db9c1624a683673adf78a442c1b11a7176901a24
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the suspicious link found in the heuristics. The ML classifier also strongly indicated maliciousness, suggesting the PDF is designed to lure users to malicious infrastructure.

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/wb?keyword=poaceae%20family%20pdf
    • http://gedira.pipersnectar.com/uploads/1/3/1/4/131452903/00ab9.pdf
    • http://files.myveganlife.ca/uploads/1/3/0/7/130776054/9972408.pdf
    • http://files.patriciagriffinceramics.com/uploads/1/3/1/3/131380688/dezegej-mojeg-volugizat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8339/1395/files/37376254583.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/29566554975.pdf
    • https://cdn.shopify.com/s/files/1/0431/2062/3765/files/99033107484.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/dodozove.pdf
    • https://cdn.shopify.com/s/files/1/0435/4909/8148/files/75134187956.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/fapojafotopumanokufa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/44230272036.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/inorganic_chemistry_full_notes.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/sezalafif.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/madaxabex.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/33625392120.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/87134682411.pdf
    • https://cdn.shopify.com/s/files/1/0428/5536/6822/files/eazy_duz_it_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3496/files/35478062255.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_off00008aa8.bin
910b3cc92e3d08c362b25ded2f9563506736e347717ff608bc269084a224f50d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA8 5132 bytes
font_01_sfnt_off00009c14.bin
45a1805909a6dfe724d68f2ab3df829f712ffe76189fa084a3aa6eefc5ef66fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C14 10192 bytes

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