Malicious PDF — malware analysis report

Static analysis result for SHA-256 33daa34fa8128eba…

MALICIOUS

PDF

47.4 KB Created: 2020-08-27 13:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da0d79a1b78cb0058bfc65f593f3478b SHA-1: 749913043d45aba121aea91fd09cddd4fc8aca12 SHA-256: 33daa34fa8128ebad8423c9471fc67de43ab95af2d04c6ed66a2e62bd635bbb9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains URLs. The presence of a malicious redirector and a large number of external links suggests a link farm or phishing attempt designed to lure users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of malicious intent.

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=french+adjective+agreement
    • http://files.watergatecondominiumsfl.com/uploads/1/3/0/8/130814172/6945639.pdf
    • http://rutixik.tierecords.com/uploads/1/3/2/7/132712336/14785.pdf
    • http://pixofele.flos5dollarhouseofbling.com/uploads/1/3/2/6/132696414/1474447.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7130/files/82396345224.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/69378340954.pdf
    • https://cdn.shopify.com/s/files/1/0440/5759/1960/files/gizefojirex.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/6328132028.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/sefodaxafagoguzupixaged.pdf
    • https://cdn.shopify.com/s/files/1/0432/6975/0944/files/restaurants_in_montgomery_county_pa.pdf
    • https://cdn.shopify.com/s/files/1/0445/8243/7028/files/wuxurib.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/78725570775.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaxigosileworu.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_off00007495.bin
e828244ca07c3b740e0179709d0a4c47b64d5e2c8cc5bef07964a7a1d5884c62
pdf-font-stream PDF embedded font (sfnt) at offset 0x7495 5232 bytes
font_01_sfnt_off00008645.bin
a35cc652c55507f899e183d2443d36c3de2be371418c41dee6e8af3bd1083da4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8645 13428 bytes