Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dece310deb9620…

MALICIOUS

PDF

44.2 KB Created: 2020-08-10 04:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3c63fff1d5ae94ad52a8ac84d561abe SHA-1: c4de8a11b609f5aff66415da46a27a6d5afb8e5b SHA-256: d9dece310deb9620d31b4e6b7585c150e21267da89bccde3200868fc5e6db5b6
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'U bahn liniennetz berlin pdf' and the malicious URL. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or redirection attempt.

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=u+bahn+liniennetz+berlin+pdf
    • http://files.jackhuber.com/uploads/1/3/1/1/131163780/videsijisebugifi.pdf
    • http://files.wordplayclothingco.com/uploads/1/3/0/7/130739379/a227d4120.pdf
    • http://files.mistressmaryhell.com/uploads/1/3/0/9/130969681/vaxepuxususavemap.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/42600355313.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/39547427493.pdf
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/kajurinowesegopevow.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7348/files/jetitunezuloxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/functional_and_nonfunctional_requirements_in_software_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4107173541.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/cirrosis_hepatica_y_varices_esofagicas.pdf
    • https://cdn.shopify.com/s/files/1/0430/6088/7705/files/potobebulofotukux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0431/0469/8535/files/91177908135.pdf
    • https://cdn.shopify.com/s/files/1/0433/8194/8567/files/48039923096.pdf
    • https://cdn.shopify.com/s/files/1/0437/2047/4779/files/peptic_ulcer_articles.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_off00006ad7.bin
ee56f099ea09d03fb08170d3b638a5c2382f367ce166ba2b2f7138644969e5b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD7 5132 bytes
font_01_sfnt_off00007c4b.bin
651756af4db17fbcf2199389c50b9f6cf39af8117dd122c736d89cbb28798cc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4B 11700 bytes