Malicious PDF — malware analysis report

Static analysis result for SHA-256 8673cc297c021731…

MALICIOUS

PDF

91.2 KB Created: 2020-08-08 20:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e1aacd0a7ad3c8fe39b0bd139574bc7 SHA-1: c8dfe3266a01a83a41b481f37934648adf2ec86b SHA-256: 8673cc297c02173190b5b251d7af9dd2f3a3ed2e6cabb3c524f2861c072ee946
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a diet PDF. The document body, though heavily obfuscated, contains the same URL. The presence of numerous other PDF links suggests a link farm or a method to obscure the malicious destination. 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.com/pify?keyword=alkaptonuria+diet+pdf
    • http://files.cellotechnique.com/uploads/1/3/1/3/131379510/banexidigoserav.pdf
    • http://files.thewanderers.org.au/uploads/1/3/0/7/130739758/22797f3e59.pdf
    • http://mumanego.anti-agingbyrjxjelly.com/uploads/1/3/1/4/131452903/dowujabakowamum_pepimogat_naziluna.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2224/5273/files/57979464782.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/bozokijexa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/naxomusetotisofifuta.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/lipesaros.pdf
    • https://cdn.shopify.com/s/files/1/0429/3374/7878/files/panapasogipogitesumov.pdf
    • https://cdn.shopify.com/s/files/1/0431/8216/2084/files/23172545805.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1402562920.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/zafivupumetenujuru.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/12671236688.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/buxawerirupudebevinukum.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_off000109bf.bin
09e2222c9e532b8f53233e60e1ee4f89f9593fe99d1e664a9e7a426bdacf23ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 4908 bytes
font_01_sfnt_off00011a83.bin
cd5b3626c98e08a6c40275a80a2e1b80822827f11498cc228744134f16a44ac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 15964 bytes
font_02_sfnt_off00014af3.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF3 16060 bytes