Malicious PDF — malware analysis report

Static analysis result for SHA-256 191464d496b3f8a3…

MALICIOUS

PDF

52.9 KB Created: 2020-09-01 13:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d87fb2d142d6d77986b6e02e3c2d3950 SHA-1: 93a3a28175b1d5598e96d2b9eaa40ec79ba34da5 SHA-256: 191464d496b3f8a34a484687701e0de27a619ca75abcae05d019dc0fa218c5a8
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO poisoning or to distribute malicious content. One of the primary links directs to a known malicious redirector at 'ttraff.com', suggesting an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the target URL and references to 'zoology books for bsc pdf', indicating a lure to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=zoology+books+for+bsc+pdf
    • https://static.usrfiles.com/ugd/76de1a_6e690363950a43b391a4943ed802f434.pdf
    • https://static.usrfiles.com/ugd/0aab01_ea2331deeba441d1afddbad35a4824de.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0ebfcabce4c4cf0a162a5a8fcf1f344.pdf
    • https://static.usrfiles.com/ugd/6f58fb_d1ed1439f1ba42e8a938fc2c78aeb56e.pdf
    • https://cdn.shopify.com/s/files/1/0438/0524/5597/files/ultrasound_guided_adductor_canal_block_sonosite.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/bioquimica_medica_john_baynes.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f726ef6f4fc4e1ab773155ee955dfe2.pdf
    • https://static.usrfiles.com/ugd/3aee12_c37369bea1fe414aa684b1ad945a2d76.pdf
    • https://static.usrfiles.com/ugd/49be48_e65dc308bdff4ceea13fc9d764f3ea87.pdf
    • https://static.usrfiles.com/ugd/105a8c_00f0b5f1f8d54caa8d0a5e8a9d7ff3fa.pdf
    • https://static.usrfiles.com/ugd/f3cb45_7937c63d4df3421d95baabb0180fa7d9.pdf
    • https://static.usrfiles.com/ugd/bf0735_dd74537b4b6c4b51ad258a09836f10eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7384fd29ade4caf967648eed7c28ad5.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063d6.bin
4b9b1329e68440dacff1c92541880dc87bba79fa4c0a57574141a0f2f3040e32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D6 5376 bytes
font_01_sfnt_off0000763b.bin
35c0a746fcdf55e64f2ba55209f6a139fa5d4ea47dce36c63c78d1e6d66b29b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763B 3204 bytes
font_02_sfnt_off0000832c.bin
d97e055e11de589539a249dfdf9c15aca1e9caf4700104d1763a3a5d87d8f7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832C 2320 bytes
font_03_sfnt_off00008d7e.bin
065301282650ed10414129abaf702c4a61f92382ac5d2d491e867dd7f6dfbc53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7E 10252 bytes
font_04_sfnt_off0000b08f.bin
207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB08F 16224 bytes

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