Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4d09d799d4fc1a…

MALICIOUS

PDF

42.7 KB Created: 2020-09-04 22:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99b8a67fa66e007ba79311f8aabf3fb8 SHA-1: 624d87544ba8f74a264f252f926c9a3d9c46f9be SHA-256: 7b4d09d799d4fc1aceb6857d26a03196f5bdd3064e81e0c492950b66be763a3f
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'South movie 2018 new full hd' and the malicious URL, suggesting a lure for users seeking entertainment content. The presence of numerous PDF links, many pointing to benign content, likely serves to obscure the single malicious redirector.

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=south+movie+2018+new++full+hd
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ca300b_75e131a4ac334009a259b55768d8a216.pdf
    • https://static.usrfiles.com/ugd/2072cd_0862a5e9ac294c839c6166776eb818da.pdf
    • https://static.usrfiles.com/ugd/338562_875d73b8893b45409c207e39ebdab2f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e04610e10ff46a4b195ffd7d0581162.pdf
    • https://static.usrfiles.com/ugd/111c46_f073f4b1583944259d78683e7354541d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a969b4a9c56432db7f779473ec23d0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf891badc31849da8cd8b63f8aa99142.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/cosmic_energy.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6502/files/81298763716.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevegijetowid.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3032/files/honeywell_humidifier_manual_hul570.pdf
    • https://cdn.shopify.com/s/files/1/0433/4908/2261/files/dazoxulokujunevezax.pdf
    • https://cdn.shopify.com/s/files/1/0435/3064/9749/files/slayer_angel_of_death_tab.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/zegujakoxixubolurenomeza.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008432.bin
d9e3fe5f68ef85f6dfce244a303ae859f0aa49770378d6bcc8ed178e6059735a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8432 17384 bytes
font_00_sfnt_off000050df.bin
baf8fbd6a5e455bde6fcb4c615db51a9766bb1020758e3ef715a8f9f011069d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50DF 5436 bytes
font_01_sfnt_off00006362.bin
79740ef16c55b893f3c576dfb3f8cb3549df6b6d991e27cd78a7764e43a0fb12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6362 9524 bytes

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