Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78f9f5a12d52d2c…

MALICIOUS

PDF

34.9 KB Created: 2020-08-11 08:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0842a634bc2c4c7f329c6085a947c27f SHA-1: 4e7df85ee5a791b3adf40ea01523a5ec51fd86d4 SHA-256: c78f9f5a12d52d2c43bbb62822d93923d27a1a32c9c172329b5eed97a7df4477
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL and several benign-looking Shopify URLs, suggesting a link farm designed to obscure the malicious destination. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a redirection-based attack.

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=arising+direct+products+pdf
    • http://files.sweetstreet.info/uploads/1/3/1/3/131398100/4921266.pdf
    • http://files.roxaniart.com/uploads/1/3/1/0/131069869/bunopiniful-xofirurig-ganaxevategizum.pdf
    • http://files.fsgse.com/uploads/1/3/1/4/131407164/7322092.pdf
    • http://bugat.torringtondems.com/uploads/1/3/1/8/131856161/af0d0.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/archimedean_property_proof.pdf
    • https://cdn.shopify.com/s/files/1/0435/4739/4199/files/arthur_conan_doyle_the_casebook_of_sherlock_holmes.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/zaxirapikirodivikev.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/meteorological_disasters.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/lokudo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3365/5446/files/workbench_plans_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/50345209822.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/dudikowogive.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/screaming_frog_seo_spider.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/salonodewij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesulemenakasisot.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/82450084854.pdf
    • https://cdn.shopify.com/s/files/1/0437/0982/5176/files/che_guevara_history_in_telugu.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_off00004ca8.bin
21033575032f9fcff52e8cefa975159f414009cc51e1f7a7098d46f37b3c14f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CA8 5068 bytes
font_01_sfnt_off00005df4.bin
4c8851defbe1f18d9ba9f8cf42d6a296fa135323e705b66284c6a66117bc3057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF4 9636 bytes

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