Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f4dc8901250633…

MALICIOUS

PDF

42.1 KB Created: 2020-08-15 05:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f86385c9988ff5017ce360464a9ff940 SHA-1: a66ca113fca955d663d057e42e345a69c483c673 SHA-256: 37f4dc89012506333205b1a7b77afe69837762925d49bdd840e5a149df60259d
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One critical heuristic identifies a link to a known malicious redirector, 'ttraff.ru', which is likely used to obscure the final destination of the malicious payload. The presence of many links to Shopify-hosted PDFs suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall structure points to a delivery mechanism leveraging external resources.

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=vecuronium+bromide+davis+pdf
    • http://dugapa.maranathabaptistcorinth.com/uploads/1/3/1/4/131453870/sexovep.pdf
    • http://files.mindbodyspirit-yoga.com/uploads/1/3/2/6/132696111/8999864.pdf
    • https://cdn.shopify.com/s/files/1/0431/0201/1548/files/40123549261.pdf
    • https://cdn.shopify.com/s/files/1/0430/0763/9711/files/fajenixizugudevigutumasef.pdf
    • https://cdn.shopify.com/s/files/1/0437/4482/1409/files/classroom_management_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4791/9516/files/factoring_polynomials_gcf.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/autodesk_alias_tutorials_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5199/files/bobumonef.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/branches_of_zoology_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9444/9055/files/bidding_documents.pdf
    • https://cdn.shopify.com/s/files/1/0432/6850/5766/files/853539715.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/53898851876.pdf
    • https://cdn.shopify.com/s/files/1/0432/5212/1762/files/the_blacklist_putlocker.pdf
    • https://cdn.shopify.com/s/files/1/0430/1727/3497/files/bipugudifiton.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/66211369701.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_off000065ad.bin
c4102fed9746e3c41a05d0913ea541e49641eb344216b292718337755d0049cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x65AD 5436 bytes
font_01_sfnt_off00007809.bin
6af0f530024f53cf42a71ac8e2e84742c2215c81cd3fa0c578e61f1776663b55
pdf-font-stream PDF embedded font (sfnt) at offset 0x7809 10476 bytes