Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80f2c0cf2a1a362…

MALICIOUS

PDF

39.4 KB Created: 2020-08-31 05:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e3bc7d7297a6da7724e85e59c9ef20a SHA-1: 438fa42cd102bfdc97dda5b05e315f1591fb9a2b SHA-256: a80f2c0cf2a1a362abb9bcc4b2c8ae3556eadaaa98d16cd6827bc26f259167a0
152 Risk Score

Malware Insights

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

The PDF contains a lure for 'Twilight movie download' which redirects to a malicious URL. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness.

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=twilight+movie+downoad
    • https://static.usrfiles.com/ugd/4b874d_dd212a9aa4424815a9be78a1f78d8736.pdf
    • https://static.usrfiles.com/ugd/b8c837_604205606b5744b7bbbff45f4fcc0137.pdf
    • https://static.usrfiles.com/ugd/b8c837_f87842bb954040feacd7262a1cad6ae1.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/redis-_cli_commands.pdf
    • https://cdn.shopify.com/s/files/1/0431/1980/4567/files/osrs_1-_99_construction.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/minokas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mudamizoxudaxusuzo.pdf
    • https://static.usrfiles.com/ugd/e4a001_0063d4087b754dba84de20595b6a3c70.pdf
    • https://static.usrfiles.com/ugd/10e3af_55533c3033be47cab8c56c62d1ee1103.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_off00005cc8.bin
3dd8743f6fbdd3c46d1a9be2e8cf33ed417cc5c5deb674df851e2aea9a6b5adc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC8 5068 bytes
font_01_sfnt_off00006df5.bin
52c28cd43ba26b407f13d6ef604cf89f56a7bf9e47aee7ec466c2a7775d2251a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF5 10440 bytes

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