Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfe0ceeb0b4e250…

MALICIOUS

PDF

66.8 KB Created: 2020-09-04 08:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97dd1004ec7d65fcbb3d78b7ef0217b2 SHA-1: eacff74bd999d398857b0ae67b414587628229d2 SHA-256: 6bfe0ceeb0b4e2503c3cc4727a9be4add1b76085298ddd39cf3882cccf39ed10
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spamming operation. One prominent URL, 'https://ttraff.link/wix?keyword=balupu+telugu+full+movie++moviezwap', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness.

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=balupu+telugu+full+movie++moviezwap
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9219f8_39ef55b207784d5ebd1faff018e8ef77.pdf
    • https://static.usrfiles.com/ugd/3d0627_545e3de97b674563ac68d1bce78974d7.pdf
    • https://static.usrfiles.com/ugd/3d7af5_a9d3b8d229d64adab4b1ce97f913935a.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8571/files/sumika_fiction_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/4773/7754/files/barcelona_vs_inter_milan_highlights_video.pdf
    • https://static.usrfiles.com/ugd/b8c837_8089be3df47d4945b5b6ba07f7465d95.pdf
    • https://static.usrfiles.com/ugd/04e6f9_ae97b0c8bc0542b3951aa543acdc7602.pdf
    • https://static.usrfiles.com/ugd/1be480_ab167ad3dcd4403599fa879412fd649c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a16243ebcdbd4868bbc87085dd1323c0.pdf
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/68302782744.pdf
    • https://cdn.shopify.com/s/files/1/0469/0522/9474/files/messenger_for_mobile_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3637/files/zunokoxigebovoxusejoja.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/kogijufus.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_off0000b253.bin
8b3064ee8436ff05ccc304168f98f06c31c566811024cbad1b16874d1d707647		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB253 5196 bytes
font_01_sfnt_off0000c41d.bin
fc27a76b08b8d97d622c638a1bd5248740a74b2d6d086d9a316591b005872102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC41D 10580 bytes
font_02_sfnt_off0000e87d.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 16164 bytes

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