Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe9f17541ec9ab5…

MALICIOUS

PDF

127.2 KB Created: 2020-09-09 09:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02b4a371859ca8d6fc583831efe7f9ea SHA-1: 4e3ee26aa37b850be9c4ea464ea39118d2e53b0d SHA-256: 4fe9f17541ec9ab55ce85e5fd14ab44957ce504d9ad5210fa1d49b409cd90f43
158 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript and a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains text related to 'Google ads search certification answers', suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to a phishing or malware site. The ML classifier also strongly indicated maliciousness.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=google+ads+search+certification+answers+september+2019
    • https://static.usrfiles.com/ugd/47e66e_65d9ac5303c6420b83b59c5637726275.pdf
    • https://static.usrfiles.com/ugd/7f614e_aa3f3881886f430c98a12390e0549b6f.pdf
    • https://static.usrfiles.com/ugd/0779a3_a7b5916a7cb642aaa2cd42dafa86f5e4.pdf
    • https://cdn.shopify.com/s/files/1/0432/1158/7752/files/12522212133.pdf
    • https://cdn.shopify.com/s/files/1/0466/3027/3189/files/xowuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/forrester_research_reports.pdf
    • https://static.usrfiles.com/ugd/5c7528_542c68bcaf604378ad2bad1bceab2376.pdf
    • https://static.usrfiles.com/ugd/74a852_572dab088b3f4ca79ebdeeaed65fd055.pdf
    • https://static.usrfiles.com/ugd/4ae4db_d3d431a3227b418fada7102e4a61fe46.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc86ab8a4433493baa4009303d39af6d.pdf
    • https://static.usrfiles.com/ugd/2f07a1_5acf1d6d973845829282176e5c09bb50.pdf
    • https://static.usrfiles.com/ugd/3fd21f_1ccc69280fa34485b77b201a68708f83.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_off0001a384.bin
0f55a73b4a99ab6b1302593922b9ac32cdaca3391c5141a2e29f10dab020afbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A384 6100 bytes
font_01_sfnt_off0001b82f.bin
ecf08e5c03c17cf19093690e123bdc44b7339e0ae06f7562a02a037ba7f947c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B82F 12648 bytes
font_02_sfnt_off0001e0b9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0B9 4324 bytes

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