Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b4149a679f1f82…

MALICIOUS

PDF

44.4 KB Created: 2020-08-31 19:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec97fa17d7518590cb8e4bd1215641d1 SHA-1: bac7217eaee81dc567d67c0671e2baba62769d32 SHA-256: b2b4149a679f1f82a39a03976d29edd83677c938bf1971e4ea8479dbe74e189a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'baccarat free game for pc' and the malicious URL, suggesting a lure to a scam or phishing site. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates a high likelihood of 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.cc/wix?keyword=baccarat+free+game++for+pc
    • https://static.usrfiles.com/ugd/0789d5_b63363032dc44d86a2c1f1275356962f.pdf
    • https://static.usrfiles.com/ugd/4d6844_8ced0e7da717476cbe4249ed76e12f61.pdf
    • https://static.usrfiles.com/ugd/b8c837_786b29f0b22e4a6780c170107ac82d8c.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/date_and_time_format_in_canada.pdf
    • https://cdn.shopify.com/s/files/1/0439/3477/7499/files/revejelamejagusajo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34515707504.pdf
    • https://cdn.shopify.com/s/files/1/0430/2661/2378/files/44910877965.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/co_operative_housing_society_bye_laws_2020_in.pdf
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/galenica_sante_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/gabijilip.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1821/files/kadujizu.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_off00006f8e.bin
e494dfd6d1e1eefc009389f07cbd038ed67c336fbaa8c49bcfd266ec111db5da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8E 5172 bytes
font_01_sfnt_off0000811b.bin
a741db255c7235d9c0ee57d33526a4a512ac5c7a2a45fb63c182a149fb3f3bc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811B 10592 bytes

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