Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21675458782480a…

MALICIOUS

PDF

51.4 KB Created: 2020-08-29 16:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07a1a31f000afc4738f80e8858e692d3 SHA-1: 9e09fecdc56551583c18cbd5a3d0771f27ae0db3 SHA-256: a21675458782480af6a73908884b5f94709088d9215328c1e2db33a61acbcb3e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL https://ttraff.ru/wix?keyword=mod%25C3%25A8le+de+barkley, which is flagged as malicious. This suggests the primary purpose is to lure users to malicious infrastructure through a link farm or redirector.

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.ru/wix?keyword=mod%25C3%25A8le+de+barkley
    • https://static.usrfiles.com/ugd/7ff653_44cb0d2dea9943eb801734bf0408a044.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc17681cc45544259d04b49a771b5b28.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a4a28552da14ee794c5e4c0b8485d81.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa1d48ee2241479585c769cc68060bd9.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_c7d870ec84bd495f98039de330fd17fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6d52c594b6346f6a852138a574443f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c720883fa70a4b16aa28daeb13e60fa9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4adedca71c6249a7bcc29ecf813a5d93.pdf
    • https://static.usrfiles.com/ugd/d01287_769ce9a67d69494eb1e2d533d15514b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_607cf5f478734dbaa885c6cc1aadfda5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e0cc46f18ff542b3bfe17710fee3003e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f9fc17a04d442549d9519356a8adbaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_7430fe01572444d5a71cf611f5bbdda0.pdf
    • https://static.usrfiles.com/ugd/b8c837_eecf3555d2324c12a924b07dbb9659c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_117d75b6444e4070a4938bab2526fbed.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f9326a119f7485cb276171c83afeed1.pdf
    • https://static.usrfiles.com/ugd/b8c837_91d3b7603ce94cd786edf732d69ff3ea.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b09.bin
da0ce226273c3c782314c3f82c1342a96d13353601fd7ef05e321d3c97a8f855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B09 4648 bytes
font_01_sfnt_off00008aa5.bin
6e119253f8aea84cd1e36acf764faf5a885001a7f8ac54b21a26a32c96d6f15b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA5 12488 bytes
font_02_sfnt_off0000b110.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB110 4324 bytes

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