Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a780e3f76ead9a8…

MALICIOUS

PDF

43.4 KB Created: 2020-08-03 22:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edfd25ddc20f82ac3bcfba270c7ae0b5 SHA-1: 99a485ac09a0d07151c220720bce1cdec0f8b0f7 SHA-256: 8a780e3f76ead9a801b864fb5a1b79910390a5456afc5be29c954158faaece96
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link redirects to ttraff.com, a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to download a PDF that ultimately leads to malicious infrastructure.

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=catecismo+infantil+catolico+pdf
    • http://files.ikchew.com/uploads/1/3/0/7/130775848/dimuvatufi.pdf
    • http://files.sthlmtapas.se/uploads/1/3/0/9/130969424/70aa62.pdf
    • http://files.floridapantherfestival.com/uploads/1/3/2/6/132695492/piwuwa.pdf
    • http://files.teraflare.net/uploads/1/3/2/7/132740172/nanezuxetirurob.pdf
    • http://files.nefrologiedagen.nl/uploads/1/3/1/0/131070849/xigomusakid.pdf
    • https://cdn.shopify.com/s/files/1/0433/4940/9960/files/goverojusukon.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/7513669344.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/23000721161.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/lomase.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/gekamamuderegomeporuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/dogetizugebaxosigumav.pdf
    • https://cdn.shopify.com/s/files/1/0439/1406/8123/files/gagafip.pdf
    • https://cdn.shopify.com/s/files/1/0433/7405/1491/files/58316889701.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/11644768424.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85213016947.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/rurag.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_off00006d8f.bin
f445d7692501f20669af04c3f6e2bce2c3da0d2fc5c23255ed1a84eb8559d834
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8F 5108 bytes
font_01_sfnt_off00007edd.bin
36b6f94590230f380181416bbcbe40fb13e02a760546df75e9ea511a79a7b73c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDD 9940 bytes