Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad80afb46f701c5…

MALICIOUS

PDF

32.8 KB Created: 2020-08-31 12:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35fa83bd043d838b172a3d8ac88b0430 SHA-1: e25a96a9ad80a8988df56413a09d57b64dccf440 SHA-256: 7ad80afb46f701c5c4dfe9bee033d3b50edfd1c3ae2984fecb2610c856e9ee06
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Spanish comparatives and superlatives worksheets' and the malicious URL. This suggests a lure to trick users into clicking the link, likely leading to further malicious content or downloads. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=spanish+comparatives+and+superlatives+worksheets
    • https://cdn.shopify.com/s/files/1/0465/0975/2478/files/4541116169.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/96323049539.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/vomupiwebuge.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4870/files/xibilapilogagegumemuxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/miparimuziv.pdf
    • https://cdn.shopify.com/s/files/1/0436/6696/4630/files/jises.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/54460450106.pdf
    • https://cdn.shopify.com/s/files/1/0435/9028/7517/files/28829894608.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/devurogefijigebil.pdf
    • https://cdn.shopify.com/s/files/1/0462/7929/5125/files/19007146126.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_off000042e4.bin
4cf84c7a78ee8c66576f9cd1a93796318a2552537bfff57e81d0dd41330bbc0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42E4 5632 bytes
font_01_sfnt_off000055f7.bin
030d00f4b61a0eac1b7d28e7a101b4d28be8b4928d099eaac661f631d205cc9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55F7 9544 bytes

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