Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a44bf8457b462e…

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 17:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3882071b2e77dd6b3feebd7f6d52dafa SHA-1: 157539b0da4d2b8572fbdf6d6ca88c2ca439ec96 SHA-256: 94a44bf8457b462e3229afceb0366cf837d0774afab793286f3ea9143cd96341
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The PDF also exhibits characteristics of a link farm, likely intended to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to redirect users to potentially harmful content.

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.cc/wix?keyword=administracion+de+proyectos+de+construccion+libro+pdf
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/deccan_chronicle_hyderabad_astroguide.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/53911330718.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6649/files/25160782746.pdf
    • https://cdn.shopify.com/s/files/1/0440/6696/3621/files/puvil.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/amadeus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/adobe_acrobat_pro_dc_editor_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/88969745055.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7096/files/schaeffler_bearings_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/95462013692.pdf
    • https://cdn.shopify.com/s/files/1/0434/0822/8508/files/measurement_of_bioavailability.pdf
    • https://static.usrfiles.com/ugd/756799_c4c7b2b9d0ce401586b71c13284e8c2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a07fc6a5c9944264849d48f7df5bd6ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab7a096ce89f4b098577212538215d70.pdf
    • https://static.usrfiles.com/ugd/0a593f_33409430a650401ca3015ccfd3a0db82.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_off00005d9e.bin
993575ef633f704b397260dae7849280ec54d44974133361a9a95422dfbcd7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9E 5532 bytes
font_01_sfnt_off00007049.bin
468dbe9c2844f74791c0797a09a553261764709ee54274a3e4df25831e5d59f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7049 11592 bytes