Malicious PDF — malware analysis report

Static analysis result for SHA-256 255d6f79e8f23bbf…

MALICIOUS

PDF

41.0 KB Created: 2020-09-01 19:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2539febf9be8cdbd4ee483044bff4c15 SHA-1: 9304dbe4aa87f30a88c06d2dd21559fd8f66897f SHA-256: 255d6f79e8f23bbff332ec7c667dff996d180b2f94e53a731020fc23de18b130
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a link to a known malicious redirector (ttraff.cc). It also contains a large number of embedded links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The document body itself is heavily obfuscated but contains the malicious URL. No scripts were extracted, but the presence of a malicious redirector strongly suggests a phishing or malware delivery attempt.

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.cc/wix?keyword=asajj+ventress+lightsaber+form
    • https://static.usrfiles.com/ugd/b8c837_ed11edce889742b6ad23190d87bdaf6b.pdf
    • https://static.usrfiles.com/ugd/83f04e_cddb51f2b65e404fb6eeef275c74dd92.pdf
    • https://static.usrfiles.com/ugd/ea78e0_46ebc33a14224dc79c2b9dc5a4c10779.pdf
    • https://static.usrfiles.com/ugd/b8c837_87d00bb687ca4e67b4ae52a38c2d35ef.pdf
    • https://static.usrfiles.com/ugd/0c41e7_712748effc6c47f1a93682e810f4923a.pdf
    • https://static.usrfiles.com/ugd/01e791_1402d5dff9584d6a9710efed10ab01d2.pdf
    • https://static.usrfiles.com/ugd/238140_54e97328d4ee48969d197bacb2911885.pdf
    • https://static.usrfiles.com/ugd/b8c837_41739e46bade405d8169c1762424a5e1.pdf
    • https://static.usrfiles.com/ugd/9e14ca_a7a1da6b4e2a46e89f09c52a5b7ead02.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_6556a76e239841d5a026376ef0615b33.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ea82feab48846e2affe08e1fd49485a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9bd70585d6d14b55b562ffd30a412f7e.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3176/files/bdmobi._com_song.pdf
    • https://cdn.shopify.com/s/files/1/0460/5856/9883/files/blast_furnace_nptel.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_off00006280.bin
a458862bd094120949088b0f8a473e5442802a577036832cd0c9c447a455ec34
pdf-font-stream PDF embedded font (sfnt) at offset 0x6280 5444 bytes
font_01_sfnt_off000074e9.bin
8088e84054fbd07bec14c8f26eb93d83d52f64c008666b42752e64316720b6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E9 10008 bytes