Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cd5f7e2933fc39…

MALICIOUS

PDF

63.1 KB Created: 2020-08-03 12:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc913ea97aa80485a1542fd8eb0af1f9 SHA-1: 3ccbe3329b45347edebfecd90b651f02abd3b010 SHA-256: c7cd5f7e2933fc39f4f69637bc2a061e1d3114de4a7e136271d716cc5c12a540
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a high number of embedded external links, a common tactic for link farms and SEO poisoning. One of these links, https://ttraff.com/pify?keyword=ascended+master+light+pdf, is identified as a known malicious redirector. The document body contains garbled text but includes the same URL, suggesting it's the primary lure. No scripts were extracted, and the PDF structure itself does not indicate specific exploitation, hence the focus on the redirection aspect.

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/pify?keyword=ascended+master+light+pdf
    • http://dexokokop.southforkwatershed.org/uploads/1/3/0/8/130874050/pelenowanojesavap.pdf
    • http://files.paulmetcalf.net/uploads/1/3/2/6/132682563/4319599.pdf
    • http://biduminib.hedongreenprint.co.uk/uploads/1/3/1/6/131637240/waxegudoxiti-naforavulo-xipibilogusov-vudebaze.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/mobivizuva.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/kuvepit.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/fezozefap.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/25964824128.pdf
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/aditya_hrudayam_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9927/3882/files/best_discord_bots_2019.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/13940731293.pdf
    • https://cdn.shopify.com/s/files/1/0434/2841/3607/files/seiken_densetsu_3_best_party.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7618/files/39499557719.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5084/files/ruselalekofuzivamezimili.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7051/files/clicker_heroes_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/46035859803.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_off0000b9dc.bin
e9e183b36ab76da46f030953ad9726062eee1617b9c1cf13974bec77e61b9aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DC 5556 bytes
font_01_sfnt_off0000cc94.bin
cff4e36be16ceef2d2b9caa12c64a433c70919d671c350c9178f23ed8170b75e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 10304 bytes