Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92e9ed132a9ebbc…

MALICIOUS

PDF

37.7 KB Created: 2020-08-08 16:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1af94a574bb8847f1092daa68fb323de SHA-1: 0d4852e44c1f2cb8d9e98706fdae3acad91deaa8 SHA-256: d92e9ed132a9ebbcd9cc92392c9cff22746b0463175c138e58a8554320f8ca44
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to further malicious content. The document body and embedded links suggest a lure for free PDF downloads, a common tactic for distributing malware or leading users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF.

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=essentials+of+cardiopulmonary+physical+therapy+pdf+free+download
    • http://files.cloudcatmedia.com/uploads/1/3/0/7/130776575/ab8a8.pdf
    • http://nimizakep.rebeccabrillweitz.com/uploads/1/3/1/0/131070792/dosapovof.pdf
    • http://files.pft1881.org/uploads/1/3/1/4/131410812/kegeni_xumemitotavepo_sukese.pdf
    • http://tuwokexu.faithdimensions.org/uploads/1/3/1/6/131606490/tafajitigadozetov.pdf
    • http://files.barrackvillechurch.com/uploads/1/3/1/4/131407823/bokitosuvotim_zokeguxuraxi_tuximop_wajokutopuxolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/46361465232.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/git_rename_branch.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7224/files/9208790911.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/simiwupuxuxewixono.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/nigger_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/tegimogatafavedafonefil.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2610/files/vegukuwidepil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8392/3609/files/article_in_english_grammar_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/naganomonug.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/nixaverofaviwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004824.bin
ade97b03da4dcdd996619767ebdc9fa5dad8794ab80f531a2aed9e20b06f04ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4824 5428 bytes
font_01_sfnt_off00005a7e.bin
297150b611f34011480c6cdf1ce62f222782d463df5bbdf037f1301fba910f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7E 9644 bytes
font_02_sfnt_off00007b2d.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2D 4324 bytes

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