Malicious PDF — malware analysis report

Static analysis result for SHA-256 6335d598212f6eda…

MALICIOUS

PDF

37.5 KB Created: 2020-08-25 07:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 377a616c448e453453adf0114935e469 SHA-1: 51b4e5d89421d8c41622b2d74cbf7f11381d52f5 SHA-256: 6335d598212f6edab0456306b94d4d1cddf9ae523b0cddb6c74ae935c7a87c2c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the malicious redirector link, suggesting a lure. The presence of multiple embedded links, many pointing to Shopify domains, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=araldite+2014-+1+technical+data+sheet
    • http://files.thomsonlodge.com/uploads/1/3/1/8/131856860/jezedodezozexure.pdf
    • http://files.bozhenaevanstherapy.com/uploads/1/3/1/8/131871786/00135.pdf
    • http://files.libyanewslive.com/uploads/1/3/0/8/130873895/dotudikoj_kifatogijer.pdf
    • http://files.innerstateproductions.com/uploads/1/3/0/7/130775848/37b26d561979.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3732/5472/files/38929621796.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/87280640736.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/matuxexunewela.pdf
    • https://cdn.shopify.com/s/files/1/0439/2298/1032/files/bsc_nursing_1st_year_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/puxesatanedagasoviv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/31385697610.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6321/files/chappal_chirugali_naa_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/12648344240.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5096/files/vobeluse.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/43923886980.pdf
    • https://cdn.shopify.com/s/files/1/0436/8583/9003/files/6707378451.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/uc_browser_lite_apk_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/35582336082.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_off00005527.bin
1909ca8be99af7461f51819a08af59b843fcf2a3d433d1b39995e1bd711b0dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5527 5464 bytes
font_01_sfnt_off000067b3.bin
eeac58258ca2989ab3202280971269fd79cb47c102da94f05cd6d56aeb77525f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B3 9704 bytes

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