Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9768a3a6f392021…

MALICIOUS

PDF

35.5 KB Created: 2020-08-18 22:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17f12fc9a32a2bc0d5c4666195ecb22b SHA-1: f2a98655ff18157b606dcb2a2113d683ce4d2f47 SHA-256: f9768a3a6f392021a71556fe14c9dac83f158b95f72499302a7f54e3104c1439
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one specific URL, https://ttraff.com/pify?keyword=modern+sofa+3d+model+free, is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same lure text and URLs, suggesting the primary purpose is to redirect the user to malicious infrastructure. No scripts were extracted from this sample.

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=modern+sofa+3d+model+free
    • http://files.robertpauljones.com/uploads/1/3/1/0/131070604/518fcfbad4483.pdf
    • http://files.encounter-church.org/uploads/1/3/0/7/130740596/ff4ce0057.pdf
    • http://files.clarkparkway.com/uploads/1/3/2/6/132681992/gajofalim_kaxuso.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8448/files/vibijozudakome.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/22315659763.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/auto_repair_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/4103/7208/files/valuation_orthographe_ce2.pdf
    • https://cdn.shopify.com/s/files/1/0433/6025/6159/files/milivojowuruvot.pdf
    • https://cdn.shopify.com/s/files/1/0433/5570/1398/files/31035219010.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/57333129136.pdf
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/34877401713.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/20132075597.pdf
    • https://cdn.shopify.com/s/files/1/0437/1401/9496/files/2955542944.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_off00004d23.bin
835e3f7386d328570ecc3d280221efa32047b2111648dbd9a04bc707c188b11e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D23 5224 bytes
font_01_sfnt_off00005ed6.bin
03757762bb2f5a948757b8356f212a471590a5589f38618e7be4bddf1df5423f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 10088 bytes