Malicious PDF — malware analysis report

Static analysis result for SHA-256 b784746d897ca1d2…

MALICIOUS

PDF

40.3 KB Created: 2020-08-12 16:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da5dfcc6ae0ceca21de1c67279745a18 SHA-1: 4ba8c38bb23441cf5a1baa8ee1e3974ce7705d67 SHA-256: b784746d897ca1d2844625cdfc21bc041ac937c0938d1eece0964b3b905c5b4a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious redirection scheme. The primary attack pattern involves luring the user to click on these links, which likely leads to a phishing page or malware download.

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.cc/pify?keyword=audre+lorde+black+unicorn+pdf
    • http://tiwak.cyn-dboxers.com/uploads/1/3/1/6/131606490/3f858e7343600f.pdf
    • http://files.concepts2realities.com/uploads/1/3/0/7/130738799/zogatobikake.pdf
    • http://wotoje.ninosfamilyrestaurant.net/uploads/1/3/1/6/131606407/rulaweberif.pdf
    • http://files.elizabethwright.net/uploads/1/3/0/7/130775786/06de9f.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/89626370496.pdf
    • https://cdn.shopify.com/s/files/1/0434/4669/8146/files/57319061559.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/25_principles_of_adult_behavior.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/sirasitemapotipimo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2242/6013/files/32771390974.pdf
    • https://cdn.shopify.com/s/files/1/0431/9028/8535/files/75725807406.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7836/files/analog_computer_simulation.pdf
    • https://cdn.shopify.com/s/files/1/0437/9780/7265/files/76151860910.pdf
    • https://cdn.shopify.com/s/files/1/0431/5866/7430/files/how_to_stop_ads_on_samsung_s9.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45397061855.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/bisinuxunaselu.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_off0000612a.bin
4755b2e5b9a38f3e51b42326ddb7cb14383450ef7a8a03b996ba7ddd129d5d87
pdf-font-stream PDF embedded font (sfnt) at offset 0x612A 5164 bytes
font_01_sfnt_off000072c0.bin
483e3603a712d07f8d4f191ada9765dcb9417dd368d46a447ddb3da8ba9bebec
pdf-font-stream PDF embedded font (sfnt) at offset 0x72C0 9848 bytes