Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b0c044555d7704…

MALICIOUS

PDF

44.5 KB Created: 2020-08-26 14:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccd5a1ab60c611cb8761a5adca522681 SHA-1: c3eb928527ed4ad56b3226d9e556d15abdedfba7 SHA-256: 37b0c044555d7704ce0b34ca5fc8f8a1677bb1f22bf588fe114053a872c02194
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector (ttraff.ru). The document body, though partially corrupted, includes the same URL and references a book summary, suggesting a lure to entice users to click. The presence of numerous Shopify-hosted PDF links indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the true destination. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=ronald+takaki+a+different+mirror+chapter+1+summary
    • http://files.circlevillebands.com/uploads/1/3/1/6/131637881/585251.pdf
    • http://bavuli.personalpilatesma.com/uploads/1/3/0/7/130739235/d91eb7bf6b.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/mumuderazunexinuxonuxe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6517/1354/files/autoit_for_selenium.pdf
    • https://cdn.shopify.com/s/files/1/0432/5015/5688/files/lowimezedesagubogoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/3273/9989/files/bidopiroxekapivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6844/files/20307001560.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5395/files/86484902992.pdf
    • https://cdn.shopify.com/s/files/1/0462/2601/4362/files/84865196907.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/16968655780.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/honda_small_engine_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6594/0904/files/kulimimosafubujile.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9137/files/retovujujasisaluwis.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fdb.bin
cb6a1f07736709e6271a16f5824e871f5bca7b5e4b27457d1756b31cbb734b43
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDB 5620 bytes
font_01_sfnt_off000082de.bin
6aeba315bab44486033cda97b9dc22e296af2f07b6d9729480b619bbbd364712
pdf-font-stream PDF embedded font (sfnt) at offset 0x82DE 10040 bytes