Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcab42b239b78f7…

MALICIOUS

PDF

45.0 KB Created: 2020-08-30 12:39:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1b6d871aaf965ae319441ba1213ea4d SHA-1: 67fec612ed906f929e1b471a9baea279a99380f1 SHA-256: abcab42b239b78f7ea1d5acefb4a67feab4867a6524f8692e5886ca94fcb31b6
152 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to appear as a weight lifting chart, but the primary link redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious redirector infrastructure. No scripts were extracted from this sample.

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/wix?keyword=printable+weight+lifting+max+percentage+chart
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/tonakozupepiseturib.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4678/files/28290892198.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/goguravedigevonatezi.pdf
    • https://static.usrfiles.com/ugd/26938b_088ea5039d394954b6ea487b7efb7524.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_641699a6ba6e48d999b5d7c5808a9f0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c62845e577214cf29958dd296c3186c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbb400a36ca84a078d6a91bcc7b9d5d6.pdf
    • https://static.usrfiles.com/ugd/2813e2_5b55b424fbed43f99542434945d861b9.pdf
    • https://static.usrfiles.com/ugd/238140_cb57fab9edbe489c9d1638cf8991efd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_afbd93ee4301402d84b82ea47b436e8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d2c3bb36f12404e811aa3ac48835d09.pdf
    • https://static.usrfiles.com/ugd/91e123_a689a70b30ee4be497f924987f46e4e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_549c9876e97844ce934c9dd34441b7b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5a42b1e2bd64bd5809fbedd7ab6d539.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_off00007210.bin
19c36b93b99a5758e93cee24c15c12cb279055a6ca13b1cb316e7c34332db0ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x7210 5552 bytes
font_01_sfnt_off000084d0.bin
e4ff995c3944d40b3bf4246cdba199ad4db93b620d97b9d99369ea268a4dd707
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D0 10072 bytes