Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3bcf2ddb48532dc…

MALICIOUS

PDF

42.2 KB Created: 2020-08-31 15:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0e5093eb0065c77eb9916fdb5868e3 SHA-1: a5d89fcf6611d406ee36759a17fc74ae1ea2705a SHA-256: c3bcf2ddb48532dcede5fdb2612f359b430ab9098de8325c293ab8253c665711
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 benign Shopify URLs, but one critical link to 'ttraff.com' is identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Experienced nurse cv template' and the malicious URL, suggesting a lure to a phishing or scam site. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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/wix?keyword=experienced+nurse+cv+template
    • https://cdn.shopify.com/s/files/1/0454/0868/2152/files/android_kotlin_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/21047500319.pdf
    • https://cdn.shopify.com/s/files/1/0440/6453/8776/files/witutixexujod.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/15969629889.pdf
    • https://cdn.shopify.com/s/files/1/0431/5765/1613/files/12116425808.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/python_set_precision.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/50106836921.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4865/files/scientific_computing_an_introductory.pdf
    • https://static.usrfiles.com/ugd/2b25b5_8e1ef50e6d18409780cbf27c9e4c3b67.pdf
    • https://static.usrfiles.com/ugd/f96b02_349d67753a8c436b98868ccc828cc37d.pdf
    • https://static.usrfiles.com/ugd/529dbf_c4c62d3ba21a4ba090f2e15a94677293.pdf
    • https://static.usrfiles.com/ugd/36f25b_f23686e003bb40438666d72a80402545.pdf
    • https://static.usrfiles.com/ugd/253000_7008dcf1f90e4c96af7f3f8b922c031b.pdf
    • https://static.usrfiles.com/ugd/de60da_7ce1561d5d014f12a06215ac481f35b6.pdf
    • https://static.usrfiles.com/ugd/ac51ce_677d2ed80aa94aa88574233281f685a9.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_off00006557.bin
1da449ad301606aca35b2442cba35af74eb03a137af6172144f9ab1e53bd4499
pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 5304 bytes
font_01_sfnt_off00007752.bin
a917cdb56b08187844c3a85db41421dab0129965047f78b4dd8825236811a5a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7752 10828 bytes