Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ef881295b73fb9…

MALICIOUS

PDF

73.0 KB Created: 2020-09-16 19:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26244e64f01a3eeeef19b7f7da7015ca SHA-1: b3e4d045f67eb33ae509130b415026e4b68361db SHA-256: 47ef881295b73fb95a379c3fed8e6cf28d2f82f528af0bb1a067e62e6467bdb3
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a large number of external links, suggesting a link farm or redirection attempt. One of the embedded URLs, 'https://ttraff.link/wix?keyword=chapter+3+exponential+and+logarithmic+functions+answer+key', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'chapter 3 exponential and logarithmic functions answer key', which may be a lure. 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.link/wix?keyword=chapter+3+exponential+and+logarithmic+functions+answer+key
    • http://xanuzimo.purebeautyphotography.com/uploads/1/3/1/6/131606349/wixij_gerilumame.pdf
    • http://dowepe.royalmarineser.com/uploads/1/3/2/6/132696067/73c939504ed6375.pdf
    • http://files.seniordogmoments.com/uploads/1/3/1/6/131607712/419d5f8beba.pdf
    • http://files.marleekatz.com/uploads/1/3/1/3/131380083/dd9e01884268.pdf
    • https://430a6576-7ca3-4cb8-b372-59b9996aa759.filesusr.com/ugd/76aeb6_683fa6a33eae49119613a6b2331be973.pdf?index=true
    • https://3044af42-6901-4072-8897-e40998ed6f86.filesusr.com/ugd/f08e01_0555d05fcd034d6c9b0fbfa247c81eee.pdf?index=true
    • https://8a892f84-fc96-4baa-8ca5-d835c1f8378c.filesusr.com/ugd/e3325f_2356872449f346b6bec17da9127c2174.pdf?index=true
    • https://5751e629-9b96-4b9d-9593-d6543fa0276d.filesusr.com/ugd/6cf0f5_2bc62fa066ec463d803e81bcd0fb4211.pdf?index=true
    • https://10e3bbbc-f7fe-419f-b1e2-95d319d53cda.filesusr.com/ugd/3225da_8b01116ff41f4a78be23428b2ccaef35.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/85443509284.pdf
    • https://cdn.shopify.com/s/files/1/0482/0654/5050/files/duniraxivudekazasepuguw.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/97627954566.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3801/files/giwomefotisudaxebuvon.pdf
    • https://cdn.shopify.com/s/files/1/0434/7625/4873/files/hawaii_drivers_license_renewal_gold_star.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_off0000d011.bin
11fa698443f6fc3afc2dfe55e7d337513ae75e3c1ac80cb76bfb9e1b88e631d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 5964 bytes
font_01_sfnt_off0000e452.bin
f22b10e2da58ad631988b6e4913fe933ae9bc2aa8a51e5e6107ab2c1f66a0058		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 15924 bytes

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