Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86d8ff74d6d4543…

MALICIOUS

PDF

61.5 KB Created: 2020-10-31 22:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 94a328ea4dc8bf8699bd527bf1c4b3b7 SHA-1: 3724e6e10bd8603bb2cae50bea2d1a633a73b3b3 SHA-256: f86d8ff74d6d454314c289495a186d93d5f4ce6c80c2dd91a920cc3207bf2c67
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristic. This suggests the primary purpose of the PDF is to lure users to malicious websites.

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://gettraff.ru/aws?keyword=ffxiv+gae+bolg+novus+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_5f959cf6377b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f918e485e004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f8754b31b8a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387430/normal_5f8eff4a25ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f9207f1294a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f8c20f9e4a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5f9340827ee84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f8ce542d8920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_5f92392a10d5c.pdfIn PDF document text
    • https://nasijominazol.weebly.com/uploads/1/3/4/3/134366940/baxesu_malepafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2530/8064/files/reproductive_system_of_leech.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/48604038728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0489/4454/5969/files/flomasta_22601sx_wireless_thermostat_instructions.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000be47.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBE47 24300 bytes
SHA-256: e07e3ae362f17457a49c481df37632b845a9f03e0210dade0c9bf5bcc1dab2e4
font_00_sfnt_off000087a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A7 5200 bytes
SHA-256: dd531b60960c711d087d5966e18f28a38a06fa91b29a4f73a1afb03f13fee51f
font_01_sfnt_off0000997f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x997F 10700 bytes
SHA-256: 7399fac500aaf328fb72601b78a495c496e9188946854d250be710ffec1c58f3

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