Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73997c626cc49fe…

MALICIOUS

PDF

35.5 KB Created: 2020-09-05 12:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 019d238b1cd5fe29fb04cc6a2de9c244 SHA-1: 635016a0712d24f789706bf9a571cd9b5e3c1f57 SHA-256: c73997c626cc49fe382e13cb169a362272c46d6ed2d702f947bb2efe2ff81332
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=audio+bible++esv'. Another critical heuristic indicates this is a PDF link farm, with many links pointing to 'static.usrfiles.com'. The document body, though heavily obfuscated, also contains the malicious URL and several benign-looking URLs from static.usrfiles.com, suggesting a lure or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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 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.com/pify?keyword=audio+bible++esv
    • https://static.usrfiles.com/ugd/defdb4_a067bbb20c164a2b8ef54b5106141061.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_b5c722bd52084678a740b12a6bf24216.pdf
    • https://static.usrfiles.com/ugd/3e87bf_094e9f5f722045a8bbf9b96b163c5872.pdf
    • https://static.usrfiles.com/ugd/7008f3_bb847120957a4ff5bb2d0da771f11764.pdf
    • https://static.usrfiles.com/ugd/0b1cf2_63604ed9a9d345c6bf583f768c0e325b.pdf
    • https://static.usrfiles.com/ugd/7603ae_e42d8ab8b7114fd3b7fd9ea0b3804c68.pdf
    • https://static.usrfiles.com/ugd/b148e5_4bf1c4a9a59745f1b9386f3672e2b1e8.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/jepopabefatef.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4936/files/53356703050.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/xerumisebebovomaxivujexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6545/8342/files/latest_bootstrap_themes_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0486/files/ruselujow.pdf
    • https://cdn.shopify.com/s/files/1/0430/5420/3031/files/beautiful_in_white_fingerstyle.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/voxijezovavatukimifosa.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_off00004d67.bin
6c59633a765e41abe3cb2498b3a72ea5aaa280258c68f5b6d775a1b3d9681480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D67 4700 bytes
font_01_sfnt_off00005d7d.bin
3496d37e4122132ec4e900f00c2ed640069e6aa25b2388de2783ac4fb6ea9566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7D 10672 bytes

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