Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ef5d22440f2a3e…

MALICIOUS

PDF

59.9 KB Created: 2020-08-15 04:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1528fd04394ed2385933216e5a3e440c SHA-1: 83078c7050435c4761adec804ec62ee40f1085ed SHA-256: 44ef5d22440f2a3ebb3d6f11a1cc779b294a069647101ea23ef87cb925ec18ec
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing on a link to a known malicious redirector. This redirector points to a PDF hosted on a Shopify domain, which is part of a larger link farm. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains embedded URLs, suggesting a lure to external malicious content.

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=snt-+tc-+1a+2017+pdf
    • http://bekupepal.sonnetaccountants.co.uk/uploads/1/3/2/7/132740435/3720366.pdf
    • http://files.ycducky.com/uploads/1/3/0/9/130969220/ae34f0c04682133.pdf
    • https://cdn.shopify.com/s/files/1/0443/1986/7036/files/7625851643.pdf
    • https://cdn.shopify.com/s/files/1/0430/7186/4993/files/80774045650.pdf
    • https://cdn.shopify.com/s/files/1/0432/6172/2788/files/ansys_hfss.pdf
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/bernardo_nante.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/mavasanuwoseb.pdf
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/66686093211.pdf
    • https://cdn.shopify.com/s/files/1/0429/7129/9999/files/borges_the_library_of_babel.pdf
    • https://cdn.shopify.com/s/files/1/0433/8571/6901/files/los_angeles_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/nj_mvc_registration_renewal.pdf
    • https://cdn.shopify.com/s/files/1/0439/1262/6344/files/fifimuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9189/4176/files/wii_u_title_keys_for_usb_helper.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088aa.bin
3f80cc6ffa02fdf73266a1a6e1cb13d1348a10379544bd2734f61b767bfe4090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AA 4896 bytes
font_01_sfnt_off00009963.bin
379bf4de65154c22f899cd6315a2ceb0bdcaf8c9d7fa481555d31628443687b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9963 11312 bytes
font_02_sfnt_off0000bf39.bin
31a7404bbf73a4dc9e965741d53d3d0e971c8e615cab9c0278bfb1b9645f99af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF39 16136 bytes
font_03_sfnt_off0000d439.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 4324 bytes

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