Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df1c15e8f15647a…

MALICIOUS

PDF

41.0 KB Created: 2020-09-08 22:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09be76971bff0ad1978ae4cb0bd2a04e SHA-1: 745616e95ac8eca7eb8d62481d76d17ad01d0994 SHA-256: 8df1c15e8f15647a19db42fbe62380c6d114bd30e8217bb82bad512a5a957456
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes text related to an 'Osmosis and water potential practice worksheet' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a large number of external PDF links further indicates a link farm strategy, likely for SEO manipulation or to host further 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.link/wix?keyword=osmosis+and+water+potential+practice+worksheet
    • https://cdn.shopify.com/s/files/1/0430/9080/4885/files/dukirelaxawatoxoxumelemox.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/60615352659.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/srimad_bhagavad_gita_telugu.pdf
    • https://static.usrfiles.com/ugd/585b1d_174ee5dbc6f34261b978a642ca0852db.pdf
    • https://static.usrfiles.com/ugd/96bf9d_ccb253462fc043dea56b2fbc1f7c3b92.pdf
    • https://static.usrfiles.com/ugd/585b1d_14a3c14048bb4be095c750f4dcc1ed13.pdf
    • https://static.usrfiles.com/ugd/5899d5_8dcbb46c757e43f58fa4374cd27b069e.pdf
    • https://cdn.shopify.com/s/files/1/0432/1679/7857/files/83518633331.pdf
    • https://cdn.shopify.com/s/files/1/0432/9419/5870/files/dativerepaloguje.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0316/files/rukanib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/16785960659.pdf
    • https://static.usrfiles.com/ugd/50c35f_618f481a8a064e5b877c80193a862315.pdf
    • https://static.usrfiles.com/ugd/e32576_8459e552abf14fc8ae1cf83323d16140.pdf
    • https://static.usrfiles.com/ugd/b8c837_166c583fa7264da5955d4ece513af4a4.pdf
    • https://static.usrfiles.com/ugd/61b8bf_92d28830e00e418bb27638027ef0944a.pdf
    • https://static.usrfiles.com/ugd/3d0627_25015a6df5ad4b6898ee14b3a6bfe293.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_off00006124.bin
d3277f97813a6d3c53e0044e27c7e9f43d73685e0bad304c9af756f50ce74600
pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 5496 bytes
font_01_sfnt_off000073b3.bin
b6eaaf072e59d0bc07b3e4f30a7d14174ded2bf9c44e256549a3095c6c93880c
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 10180 bytes