Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0a1bd25dd1362a…

MALICIOUS

PDF

39.8 KB Created: 2020-09-09 02:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dd9f4efe680ac131ac469e5c7c42b80 SHA-1: 18c332de71478527b610487aebea2f0014b9040e SHA-256: fb0a1bd25dd1362a3213bc508b2157dc5499912d18239cf34cf703a49801a388
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a redirector service, which is a common technique for distributing malware or conducting phishing attacks. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, reinforcing the malicious intent.

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.link/wix?keyword=at%2526+t+stadium+seat+guide
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/womibeb.pdf
    • https://cdn.shopify.com/s/files/1/0469/9855/2728/files/google_sheets_averageif_0.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/64574844157.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4375/files/falibatagololavaxatuja.pdf
    • https://cdn.shopify.com/s/files/1/0438/4371/5229/files/africa_map_with_names.pdf
    • https://cdn.shopify.com/s/files/1/0437/9118/8117/files/falodomewelesejexavak.pdf
    • https://static.usrfiles.com/ugd/078c79_89219e6e6bbc4aa1be7ed444b11825da.pdf
    • https://static.usrfiles.com/ugd/d13e1f_278be26763a14c3b84e6a5222e742fa5.pdf
    • https://static.usrfiles.com/ugd/685707_c0bcfcf365ba42d2ab9430cb25d36773.pdf
    • https://static.usrfiles.com/ugd/440e29_beaa5baafcaf437190395b75e5980dbf.pdf
    • https://static.usrfiles.com/ugd/4ae4db_d9a298af4e0b4b4090ce5faac85afb8d.pdf
    • https://static.usrfiles.com/ugd/b444d4_1c6b41e3717c4de89936713acc723cde.pdf
    • https://static.usrfiles.com/ugd/b4609a_57d4a3bf96ff4281bd7788d696be99ff.pdf
    • https://static.usrfiles.com/ugd/cece23_a0cc72f531e64507b82587a06f7aca31.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_off00005ffe.bin
fc02dd8945052924da689f24daa8249a6b0a5d6ddc2ca787317cb0ae9dcccdfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFE 4144 bytes
font_01_sfnt_off00006e20.bin
f5e31810391663c0ddec077aa1bf6563f1f5104b180586a164fd7f985b602fed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E20 10436 bytes