Malicious PDF — malware analysis report

Static analysis result for SHA-256 761f577ad82ab1cb…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 12:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05aed57f81ccdc3beaa1b606f2c96752 SHA-1: 27bb3855b1e42c0a78dca81bc7618a2b056d44a7 SHA-256: 761f577ad82ab1cb348be15be092a64d09c7f501d89398b230a3d4fed5c7c207
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL disguised as a device driver installation issue. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a known malicious URL. The document body, though heavily obfuscated, contains the malicious URL and a lure related to a 'samsung galaxy s4 device driver not successfully installed'. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

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=samsung+galaxy+s4+device+driver+not+successfully+installed
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a18aa6_dc54fa9349ae43b18baff872b3ac9970.pdf
    • https://static.usrfiles.com/ugd/b8c837_e59af30eb9f6470893edae8e0cee8a7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2614918459544740915951193849d94d.pdf
    • https://static.usrfiles.com/ugd/d5d855_be2711944f2a46d380ccdc39ef43b416.pdf
    • https://static.usrfiles.com/ugd/2f7815_eacb6becf00e4253aecd38f3822eaf04.pdf
    • https://static.usrfiles.com/ugd/1b8612_418dbf592036486e80f174bc1ddc07de.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8890/files/wobidekoberima.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/83405565164.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/jubujiwujolimafigakadopow.pdf
    • https://static.usrfiles.com/ugd/3dd68e_93141f8a96ee4e08867832d1c6ce6b34.pdf
    • https://static.usrfiles.com/ugd/9e53d4_253077520c1c4fbd9930ec98c84accb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_61bad3644f934a5d853a47703719c7e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_11cf90d9264a4d69bbb1320605358a50.pdf
    • https://static.usrfiles.com/ugd/b8c837_477f3ffc5768402d8ab933cb0032aa9c.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_off00006435.bin
ffb9eb37fdfcf62786c2387436fcaf37fa0a2993d0d10a272ecf11f075d9ddd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6435 5760 bytes
font_01_sfnt_off000077cd.bin
07358f47b27136c7b6bac083c004ca801c36cc705298e427965baa8924c03ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CD 10736 bytes

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