Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e45922eb6d176f…

MALICIOUS

PDF

49.8 KB Created: 2020-09-03 00:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8d20e92e742c04fdf42ee15c6dce325 SHA-1: 8360a8b11e0647958a28aa94422429fd0dbad9f0 SHA-256: f8e45922eb6d176f9b19bcca393744cb0240381604424ca330e4886f16631916
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, characteristic of a link farm designed to manipulate search engine rankings. One of these links, 'https://ttraff.club/wix?keyword=ffxiv+culinarian+guide+70-+80', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or heavily obfuscated, but the presence of the malicious URL and the link farm structure strongly suggest a phishing or malicious redirection 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.club/wix?keyword=ffxiv+culinarian+guide+70-+80
    • https://static.usrfiles.com/ugd/b8c837_d25d82c8fd9f4ffeb8bf7ae5e9b12481.pdf
    • https://static.usrfiles.com/ugd/10e3af_8defbb62081b4000b9801ef940ae105f.pdf
    • https://static.usrfiles.com/ugd/b77b08_8c7f19ac79844f3189bb799dd294a1f7.pdf
    • https://static.usrfiles.com/ugd/bc79a4_20141e03fc5e44a9814ceb5756c4f879.pdf
    • https://static.usrfiles.com/ugd/436160_99f2988f7ef14f8b899f41da6a960a74.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_54e4fc79dece453384931b1480b57f8f.pdf
    • https://static.usrfiles.com/ugd/df73ab_83977c736fa0427485737b75c1292058.pdf
    • https://static.usrfiles.com/ugd/2274a7_247cf890668646f683f501f8c569966e.pdf
    • https://static.usrfiles.com/ugd/b8c837_65ba4661c4114ae5b19122fcf15efaec.pdf
    • https://static.usrfiles.com/ugd/8c0e65_09057f98d3a949fcb8006a32e6d3be39.pdf
    • https://static.usrfiles.com/ugd/e745be_05eef501e21c4b2c93b9276cd1be3b08.pdf
    • https://static.usrfiles.com/ugd/7d21c0_5ab122b1d8394a28a429ad6551d51614.pdf
    • https://static.usrfiles.com/ugd/2f8cea_cd83e9d42a2a40fcbb48aac980bee636.pdf
    • https://static.usrfiles.com/ugd/9ec29b_78ca4113ea2d473b9ce2494f3371e2e1.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_off00008473.bin
f3964921c1ad21b0b9c32c2be628b3ed92262cee013b388c911bcd6197de56de
pdf-font-stream PDF embedded font (sfnt) at offset 0x8473 5540 bytes
font_01_sfnt_off0000977e.bin
c3f25b399d687c0ee3725785ec706a63011d50af3c08a0c9e060f839708781b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x977E 10364 bytes