Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f99cdecde5005c0…

MALICIOUS

PDF

48.7 KB Created: 2020-09-04 03:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16a7f2d013b01f0603b6e184df38b508 SHA-1: db9e36c40b31f9c1548851b66bf70b17b2e84d7e SHA-256: 7f99cdecde5005c0504768b171a4f9cd21484ee4161ccf0f3f4388f270a524a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for 'staff details form template'. The presence of numerous external PDF links further suggests a link farm or redirection scheme designed to obfuscate the final malicious destination.

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=staff+details+form+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2f3ac6_f6419b2d3bab48cea60a8b306e1638db.pdf
    • https://static.usrfiles.com/ugd/9ec29b_75bcf09dea20401da347e336bc130d03.pdf
    • https://static.usrfiles.com/ugd/c0fca2_bd3fb25c6c1246c7a4fad9b391bc9d75.pdf
    • https://static.usrfiles.com/ugd/fd7405_14aa4528646b48b19090d39e51a5dee4.pdf
    • https://static.usrfiles.com/ugd/a4e402_19882c65d4e148ce9fea484dab992c5a.pdf
    • https://static.usrfiles.com/ugd/18574e_d4cee71c15f04d36912c99e834a1ff89.pdf
    • https://static.usrfiles.com/ugd/921909_a80dc0eaf60a44c69a51662ecd4f619f.pdf
    • https://static.usrfiles.com/ugd/29c71c_24f82ca5a25d4675b047d4acf444e376.pdf
    • https://static.usrfiles.com/ugd/a8cc01_e1124ca7d12248739136e1b9763d72de.pdf
    • https://static.usrfiles.com/ugd/f4de5e_21813ccdb905468d9471c7f4c37a4cac.pdf
    • https://static.usrfiles.com/ugd/565485_e26beee54d654acbb73bffc48ebf02db.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4252/files/70565930881.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/musawojonelulowad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8229/files/lowemuxaputagimudamap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/94689789609.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070a0.bin
0bb42da85977ece76c503c501b552d93d08c5e48de1d636787bd0b6dc6ffbdfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x70A0 5292 bytes
font_01_sfnt_off00008289.bin
dfa5b329e2debc92bbed98c6b5aadf94edf7dd379a0cda81037120d59380b8ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x8289 15988 bytes