Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41a7109b2fcef86…

MALICIOUS

PDF

40.3 KB Created: 2020-08-15 02:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fa4140fabac485dd22db8906733daf5 SHA-1: 44640e3a3b286221ea19f6231916c997cd4e8971 SHA-256: d41a7109b2fcef86504b9574880d69c888f6e8c6757cc07cd9abf3d70a8ca796
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'Bestway sand filter pool pump manual' and the malicious URL. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm or phishing lure.

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/wb?keyword=bestway%20sand%20filter%20pool%20pump%20manual
    • http://kalusoba.bscapitalmarkets.com/uploads/1/3/1/8/131871780/5034515.pdf
    • http://files.onepercentpr.com/uploads/1/3/2/6/132682739/tajosoxelabofu.pdf
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0428/7833/7187/files/95633969625.pdf
    • https://cdn.shopify.com/s/files/1/0427/8868/3932/files/vumumokamowoji.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/billetes_argentinos_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9802/files/girulilodudaged.pdf
    • https://cdn.shopify.com/s/files/1/0448/4349/9677/files/artificial_intelligence_and_the_future_of_work.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/minecraft_aptoide_0._14._0.pdf
    • https://cdn.shopify.com/s/files/1/0431/5516/1252/files/xerorigetedewega.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/biopac_lab_answers_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/71478310416.pdf
    • https://cdn.shopify.com/s/files/1/0437/1546/1285/files/christinia_debarge_goodbye.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_off00005fac.bin
9042883674fd35b033bafe11645ceffe54c61432417d047f9961f73446651beb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAC 5432 bytes
font_01_sfnt_off0000721f.bin
f005252c0db46bbb2d6b901e5ac59b923078d9ce17b46136aff5d1222b3500bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x721F 9992 bytes