Malicious PDF — malware analysis report

Static analysis result for SHA-256 939d65c2fa81e1ee…

MALICIOUS

PDF

41.7 KB Created: 2020-08-15 06:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 318aab2ab08786f4927118b12d925ceb SHA-1: 167cf62cca81441dfe6eabe423f39d251e5bb86a SHA-256: 939d65c2fa81e1ee7c38421014039f95b298da75d6d919a49cfbee79ace5378a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a link farm and a direct link to a known malicious redirector. The document body, though obfuscated, contains text related to a worksheet and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly indicated maliciousness.

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=point%20of%20view%20worksheet%2012%20answers
    • http://files.yaltacraft.com/uploads/1/3/0/7/130740196/zafezival.pdf
    • http://files.kimberlydeanne.com/uploads/1/3/1/3/131382808/ab75f7c.pdf
    • https://cdn.shopify.com/s/files/1/0434/3198/5309/files/36955774952.pdf
    • https://cdn.shopify.com/s/files/1/0451/4463/7605/files/california_acknowledgement_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/letras_del_alfabeto_griego.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/square_root_of_13.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6467/files/mejewipux.pdf
    • https://cdn.shopify.com/s/files/1/0435/3468/0216/files/jirujosedutubet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/zupupitawazawuzijipetuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6409/0006/files/juganuwonogopi.pdf
    • https://cdn.shopify.com/s/files/1/0436/8603/5621/files/dijojejixopubixawegonano.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/robbins_pathology.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_off00006614.bin
7f2732ac11a2a93814fd53ec9c5a4798ac5f0140df4efe9b546fe96a6777ef5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6614 5224 bytes
font_01_sfnt_off000077ef.bin
ca4568862135b0e92fc541176426a56c363e2957cf71366b2d970c0856d5c450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EF 10024 bytes

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