Malicious PDF — malware analysis report

Static analysis result for SHA-256 68017b73b4e9a94b…

MALICIOUS

PDF

41.7 KB Created: 2020-08-22 02:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b4ae33c69e73c45ce0709212c460280 SHA-1: 4d06fd8ccc379980cab32c94159d9dcc41fea4e2 SHA-256: 68017b73b4e9a94bdd2d10b76e63440378b2b60e55117d831c827cf197f5daa9
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one critical link identified as a malicious redirector. The document body, though partially garbled, suggests a lure related to Fortnite challenges, aiming to trick users into clicking the malicious URL. The ML classifier 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.com/pify?keyword=fortnite+season+8+week+5+challenges+guide
    • http://files.lmt-photo.com/uploads/1/3/2/7/132710736/ce2f78fd4be9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4317/7126/files/burodalizegoki.pdf
    • https://cdn.shopify.com/s/files/1/0454/9489/4744/files/bagasobe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/tasexigaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/8256/3232/files/double_spiderman_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5798/files/destro_warlock_pvp_talents.pdf
    • https://cdn.shopify.com/s/files/1/0440/5533/0981/files/47268370480.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/2375622922.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/56099116181.pdf
    • https://cdn.shopify.com/s/files/1/0440/1332/2398/files/31202824889.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5600/files/fezibegapujolepin.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6487/files/official_rules_of_card_games.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_off0000652c.bin
b164ff93f388aed18e894e65833eebbb8b985b47b6bc2b08dd80db4aa554dc56
pdf-font-stream PDF embedded font (sfnt) at offset 0x652C 5632 bytes
font_01_sfnt_off00007864.bin
3f81cedfae4621db6cbaf8cb09136b458da76d63f45e6259ff4c48d426abd220
pdf-font-stream PDF embedded font (sfnt) at offset 0x7864 9836 bytes