Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb09c17c3f271eb…

MALICIOUS

PDF

42.5 KB Created: 2020-08-30 19:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65e875ec74753db58559388497cffbdd SHA-1: acae47435e845a8d62fffb7a3c332039043497d9 SHA-256: 5cb09c17c3f271eb12b32b32ce8502c6a21a691bf4929aa0596e16853cac5e5e
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to trick users into clicking the malicious URL, likely for phishing or malware distribution. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are benign, but the primary malicious link is the focus.

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.me/wix?keyword=diary+of+a+wimpy+kid+book+1+audiobook
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_aef6895605b948099e0b04794335702f.pdf
    • https://static.usrfiles.com/ugd/271e65_5f88ef27c40c4b629562324879b239e1.pdf
    • https://static.usrfiles.com/ugd/1b8612_7ec6374f9bba407fbbf60274ee9d7f38.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_70f57fe76da841c39bd2eb602d24c6b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_17be61e167734b9db5ca31b26db463fc.pdf
    • https://cdn.shopify.com/s/files/1/0438/3647/3501/files/dometic_brisk_air_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/48716116750.pdf
    • https://cdn.shopify.com/s/files/1/0431/4919/7472/files/how_to_install_custom_zombie_maps_waw.pdf
    • https://cdn.shopify.com/s/files/1/0428/0870/5187/files/32463246857.pdf
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/19541922095.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/karl_taylor_s_free_photography_cour.pdf
    • https://cdn.shopify.com/s/files/1/0437/7001/9998/files/how_to_kick_yourself_in_csgo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/egyptian_cotton_sheets_high_quality.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/pixobowiz.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052f9.bin
9442e9b31de90701635673e1dbb558a398847a3e8c21b8ecfb17736bcd364281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52F9 5424 bytes
font_01_sfnt_off00006575.bin
d3f0b3c828974273a19fba9d18f5ad760b34487979d41f4a77f35397d06b7bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6575 10036 bytes
font_02_sfnt_off000087fa.bin
e7273338525a866f49bd556f13a0e46ce1e8513f85f175d9d987aa1f8b89adb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FA 16068 bytes

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