Malicious PDF — malware analysis report

Static analysis result for SHA-256 729e14ad705c17d3…

MALICIOUS

PDF

43.4 KB Created: 2020-08-29 23:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6730d28f46ac996bf9ac0def3e2ed750 SHA-1: 524c0e18e6b2d8988f98315cf4ac0d0f6f404665 SHA-256: 729e14ad705c17d31a27a0851b5bd91b07fc8a346998c5b5d1abf7c1340bb509
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the ML classifier's high confidence score. The document body and embedded link structure indicate an attempt to lure users to malicious infrastructure via a redirector. While the document body is heavily obfuscated, the presence of the malicious URL is a strong indicator of malicious intent.

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.link/wix?keyword=reg+st+buu+ac+th
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/alfred_wegener_theory_of_continental_drift.pdf
    • https://cdn.shopify.com/s/files/1/0433/6726/8517/files/rofil.pdf
    • https://cdn.shopify.com/s/files/1/0444/3511/2103/files/cash_audit_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/36579460062.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1223/files/stardew_valley_item_number_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/bofabupibidofekofo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/74306781127.pdf
    • https://cdn.shopify.com/s/files/1/0447/1855/5292/files/speech_organs_and_their_functions.pdf
    • https://static.usrfiles.com/ugd/b8c837_f62a8d606c314b7dadde0fff054d4273.pdf
    • https://static.usrfiles.com/ugd/b8c837_12eb73f1113a465d906497cf408704f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_72a8694667944921a2d1341581369d6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e78e36a1c22747dcb339d72b2da3f9c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed8fb8c4d8e64992a5596d31c00f3032.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbac040239c144b69e7ab5f200ec356c.pdf
    • https://static.usrfiles.com/ugd/b8c837_255247082a2043cfad4a63756a91029a.pdf
    • https://static.usrfiles.com/ugd/02beb7_0e01e612660f41eba716e17bbddfdbce.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://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056d6.bin
7bfb1d2f501990f3fcb54fa85e88818e14c3ef87312578d7a49bed5728dbfb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56D6 5080 bytes
font_01_sfnt_off00006813.bin
84b317bce0fd725236ec1998710ab4d8044455350216bf6d92625a625f48cce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6813 7588 bytes
font_02_sfnt_off00007ccc.bin
fdf0800340d52dbfa0808ddda5376980198f195350076d568eba4ff5cd19422c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCC 9944 bytes

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