Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69c8fa91ca58d37…

MALICIOUS

PDF

44.7 KB Created: 2020-08-15 14:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cda1ee841f9f3a61a71171abf5d7db30 SHA-1: 850725cfa8480cff678beddd1942e0c2f5e29e08 SHA-256: b69c8fa91ca58d37e1797533a1e1f373ab159bc5a9a106372e9a63d0dfaa6a3b
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with heuristics indicating a link farm and a critical finding of a redirect to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the primary attack vector appears to be the manipulation of search engine results or the delivery of users to malicious sites through a large number of outbound links.

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/pify?keyword=inadvertent+disclosure+of+privileged+information+cases
    • http://burazuju.matthew517.org/uploads/1/3/0/9/130969204/pulajajosasa.pdf
    • http://files.techmusings.me/uploads/1/3/1/4/131438389/duvugu.pdf
    • http://files.greatautismresources.com/uploads/1/3/1/4/131453498/8595107.pdf
    • http://files.resenviecon.org/uploads/1/3/2/7/132712050/kabut-xumodofiluduf.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/biosensors_in_food_industry.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/63528777145.pdf
    • https://cdn.shopify.com/s/files/1/0438/2638/0960/files/java_tutorial_free_download_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/3246/0960/files/25903457836.pdf
    • https://cdn.shopify.com/s/files/1/0440/0798/1214/files/purotunoganer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/89103896615.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/31155166019.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/metabolic_flux_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0528/files/the_coding_manual_for_qualitative_researchers.pdf
    • https://cdn.shopify.com/s/files/1/0438/2746/2301/files/space_invaders_java_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/jugewimizebova.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/95329186844.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_off00006fcf.bin
08cd7bb3f4852d81edeaadc3dc61078c7977b0f5ae403df27b85a15fc4cad76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCF 5472 bytes
font_01_sfnt_off00008255.bin
279be1737a2f6ab598b6eb9ebb6a5f0f8ddb84cfe8d0d371cafea8b0372b594c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8255 10208 bytes

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