Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b033d546aeaf803…

MALICIOUS

PDF

45.6 KB Created: 2020-09-01 04:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dea72e49ee7ef17b8a184741f007547 SHA-1: 0ee78a9f2f1d8abb63720fdc3e67cff1973b56e5 SHA-256: 7b033d546aeaf803c19529ce16982cde431cc4dfc7d9c34cb453223b9da90350
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though corrupted, contains text suggesting a lure related to 'employee performance evaluation'. The embedded link 'https://ttraff.club/wix?keyword=employee+performance+evaluation+sample+answers' is a primary indicator of malicious intent, likely leading to a further stage of attack.

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=employee+performance+evaluation+sample+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/20d83a_44d420195dfc4a1d989e28791fb5c848.pdf
    • https://static.usrfiles.com/ugd/b8c837_dca248b2fdd34075aa563d43fe792528.pdf
    • https://static.usrfiles.com/ugd/fac845_82ce76be65b04c079c54c0787bca5d72.pdf
    • https://static.usrfiles.com/ugd/934fc3_7cf35b8c55a1486596b14ec07d2dd612.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffd1bbf60eb34cfbb1c6da734c7142c3.pdf
    • https://static.usrfiles.com/ugd/0d2908_64e2259f24204cb9b3ee2c05950bc537.pdf
    • https://static.usrfiles.com/ugd/07625c_7d7dd983c90f49698cfaf8640aecff2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3544602e03e64af2b92d58f3b9961831.pdf
    • https://static.usrfiles.com/ugd/217d68_420539586f954ea8a0d6dcf0b764764a.pdf
    • https://static.usrfiles.com/ugd/269bb8_aa001ba54329460fb361137c701269e4.pdf
    • https://cdn.shopify.com/s/files/1/0433/5448/8990/files/domavalovos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000689b.bin
d93cfc32c970ddfefbc836ae325c317931e5e660a8dbd89c98bae0c7a8e2002c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689B 5256 bytes
font_01_sfnt_off00007a7c.bin
fbd8619823c7aeea85ba15fe1000c072ae288075a86954cfffa5dcf437030416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7C 9732 bytes
font_02_sfnt_off00009b66.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B66 4324 bytes

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