Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedd5eb524851848…

MALICIOUS

PDF

47.9 KB Created: 2020-08-26 11:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20611258b683802ba77ca41e68190005 SHA-1: c9c1bb0b366e2e5465231feb280a74fd4fc61b3b SHA-256: dedd5eb5248518483adc5a2264860e022df7e6d412a862a95cf99990bd7bfc5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure at `ttraff.ru`. The document body, though heavily obfuscated, contains the same Spanish phrase 'Que significa restaurar respaldo' found in the malicious URL, suggesting a lure related to data recovery or backups. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content or engage in SEO poisoning. 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=que+significa+restaurar+respaldo
    • http://files.pmcipaving.com/uploads/1/3/1/8/131858661/nuxejapuw_notajowaxopimed_dududamaxitebon.pdf
    • http://zaxupug.yessammassey.com/uploads/1/3/1/4/131453645/4221316.pdf
    • http://files.theflockjwr.com/uploads/1/3/0/7/130739831/rixorofamox_muvenid_leremelanemenom_soledaj.pdf
    • http://files.k-townstudio.com/uploads/1/3/0/8/130873783/vugexaxafazot.pdf
    • https://cdn.shopify.com/s/files/1/0430/6747/4087/files/26534668226.pdf
    • https://cdn.shopify.com/s/files/1/0431/7570/6788/files/80715778018.pdf
    • https://cdn.shopify.com/s/files/1/0435/9729/9869/files/dopogiripirotegigi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/rowizatewef.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/7007/files/malcolm_in_the_middle_full_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8926/4794/files/puzunebukunebutiwikekom.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6953/files/app_store_connect_developer_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/61038869983.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/dupuv.pdf
    • https://cdn.shopify.com/s/files/1/0462/4741/1866/files/handwriting_worksheets_uk.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_off0000652c.bin
fb57b012c6a60a6d6132bd73a45483e05047848d848013a7454986ffe8de623c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x652C 5384 bytes
font_01_sfnt_off00007788.bin
f48af80971b096f257cddedcb3e81b698adf0d1a2aec7542c04c04a2173f4ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7788 10964 bytes
font_02_sfnt_off00009b53.bin
e63b2e88872aa21a43cde8a5a99d0c7fd451646b7697e4e2c8d48a07fb0bb35d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B53 16340 bytes

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