Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8325d2a24b072b…

MALICIOUS

PDF

32.8 KB Created: 2020-08-16 23:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b619f28dce4f0229c9c88524ecb5723 SHA-1: f7b7e9aaaa7cc52bf560ef0db762b4bfc6830656 SHA-256: fb8325d2a24b072bc1b75d264d91f1b6388206936699cb4e79a615cae94eb15c
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.ru/pify?keyword=hollywood+classics+vietnam+guide. The document body, though heavily obfuscated, contains this URL and references to other PDF files, consistent with a link farm strategy. The ML classifier also strongly indicated maliciousness.

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=hollywood+classics+vietnam+guide
    • http://files.watsonauctions.net/uploads/1/3/1/3/131383924/susim-jeselufikuxusid-lazenuniximaruz.pdf
    • http://files.sweetbabiesdayhome.com/uploads/1/3/2/7/132740320/zipud_wenuv_soraminudej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/birizakidunupujudexi.pdf
    • https://cdn.shopify.com/s/files/1/0436/5913/3081/files/fasekofunagowolerejipofa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3876/1379/files/61933062375.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/vunizeveraduwewemazakigi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2336/7335/files/connect_to_mcdonalds_wifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/44475069238.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/26809526843.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_off00004146.bin
082a1c2b60cfca961055050b96348dc1e857b7969354a1a4ecdce028d032255e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4146 5380 bytes
font_01_sfnt_off0000539b.bin
ed213274b51bcb1db2f02fb21421110b9fec81f292dbfd0be55daec40af23200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x539B 10316 bytes

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