Malicious PDF — malware analysis report

Static analysis result for SHA-256 730f4d279561dd75…

MALICIOUS

PDF

43.8 KB Created: 2020-08-12 03:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6839ac190a0d60d0361da2a87e981aa6 SHA-1: 29b2219eb74b3ea87553382a37129681a5bef53d SHA-256: 730f4d279561dd757f604bd2c338f475274cef0989643b1200054ba65c94b773
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, and is flagged as a link farm. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'motivation letter' and includes the malicious URL. The presence of many external links and the malicious redirector indicate an attempt to lead the user to harmful content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/pify?keyword=example+of+motivation+letter+pdf
    • http://foduxute.milksugarbathbakery.com/uploads/1/3/1/4/131408024/599058.pdf
    • http://gilefi.mayohayeslibrary.org/uploads/1/3/1/3/131380213/4a9f4d36da.pdf
    • http://kifotujox.stnicholasplatteville.org/uploads/1/3/1/0/131070420/sodidemusigimu.pdf
    • http://vazeb.dewgirlpower.org/uploads/1/3/1/4/131437987/9a710d.pdf
    • http://mibimab.stchristophersnh.org/uploads/1/3/0/8/130814674/walapategoven.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/4956/1757/files/the_beatles_blackbird_tab.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/three_equations_of_motion.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/mowonanoxexifedumawuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/663204156.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/gafivejovizabija.pdf
    • https://cdn.shopify.com/s/files/1/0438/2759/3376/files/kapebadurejogexegofaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1027/7025/files/aguacate_hass_mendez.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/8022702369.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/english_phonetics_sounds_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3263/files/loketidezurumum.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/sazujogemewojamob.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ff6.bin
d75cb5eb2d13e8df1f51a599802292446c9b710d4912f0a73f5e434ce3e3354c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF6 5092 bytes
font_01_sfnt_off0000813e.bin
bb8ec788448fd319b761708faea1d9626781988ca898e1e97c224b8cc5c0e7b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813E 9760 bytes

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