Malicious PDF — malware analysis report

Static analysis result for SHA-256 b776acc773cd7e6d…

MALICIOUS

PDF

40.9 KB Created: 2020-09-01 02:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6391b363a3aaef67e001efe703c080b SHA-1: 585504214c427d0e4fd5eba3dc75e86627d7e7d9 SHA-256: b776acc773cd7e6dcd1f58a646bab363c0c98081ee882abb31ee0aee8c5c5e8d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains this URL and a list of other URLs, many hosted on static.usrfiles.com. This suggests a link farm or redirection scheme designed to lead the user to 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.com/wix?keyword=open+link+in+browser+android+studio
    • https://static.usrfiles.com/ugd/df4650_f6573f67e84844e6890705ead7e09b32.pdf
    • https://static.usrfiles.com/ugd/d5415a_f22509e16e864531bf430f4948087283.pdf
    • https://static.usrfiles.com/ugd/74e9cf_6510fd6fa63b486a8aecef2798e6f181.pdf
    • https://static.usrfiles.com/ugd/74c34a_d50a5110867945f1943ea70b0f1597e2.pdf
    • https://static.usrfiles.com/ugd/29c71c_05378592638b4caa8409c3c513d8e17b.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/65911632752.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/93894154304.pdf
    • https://static.usrfiles.com/ugd/0c4177_b8636813b287495f8e996f625e11c2c2.pdf
    • https://static.usrfiles.com/ugd/909b15_1ef46ccff8784703b5378bfa012ee2c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e1ead65e6914f5ca61070ed010f43bc.pdf
    • https://static.usrfiles.com/ugd/1b8612_bc698fbef8234cf1a2f6df625fb4d9e6.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_off0000615b.bin
788f59707509ea58b55d13172c9b554465e16fbd37949091be2991f916a1311c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615B 5276 bytes
font_01_sfnt_off0000735d.bin
ff3ba1467ab7af70ea52c68c181caa6c93a65df256833cfa098cb0d8bdeb92cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x735D 10440 bytes

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