Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1298870d07c6cf…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 06:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e90507dd16393b82f3036a79acd28ac SHA-1: 63d5e7104ec952590add6b007129bbf9fc88c317 SHA-256: fd1298870d07c6cf009a441a5b290052f82337caa7eab04594ddcd830d794aca
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm containing numerous external PDF links. One of these links, 'https://ttraff.cc/wix?keyword=mcdonald+dash+locksmith+supply', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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=mcdonald+dash+locksmith+supply
    • https://static.usrfiles.com/ugd/b8c837_a7e816df90f84078a149fb3bc402d79b.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc3593a299b44a2798f240f0b686a572.pdf
    • https://static.usrfiles.com/ugd/b8c837_746157b471144a1fb978a10598d5059e.pdf
    • https://static.usrfiles.com/ugd/d4da64_aee43581dfa94e91857658a79c078269.pdf
    • https://static.usrfiles.com/ugd/74e905_bff4d7d899be497bab1d5f1887b7591c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad64b139ef814e4697fa16b5cca6eaac.pdf
    • https://cdn.shopify.com/s/files/1/0434/5574/2114/files/21508049293.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/today_assamese_news_paper_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/1_inch_thick_plexiglass_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0447/8215/7981/files/sutaz.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_217449f673294385b7558388fd2dd119.pdf
    • https://static.usrfiles.com/ugd/b8c837_03fc07f525374df0bcae17c46697bc14.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8d.bin
c0e41a24e58b5b73bb3f05f2be450a3b8b2cf623eb1c24c7031ee4eb1bdff916
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8D 5152 bytes
font_01_sfnt_off000070e6.bin
063396f3ba4736cb8cd6dc498c5e1a16a5c7d73b353efde72cbbe627900dca68
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E6 10968 bytes
font_02_sfnt_off0000965a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x965A 4324 bytes