Malicious PDF — malware analysis report

Static analysis result for SHA-256 379554e4acd80524…

MALICIOUS

PDF

55.9 KB Created: 2020-10-07 11:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5ab25c8538e385cd55335d85876768c3 SHA-1: ace4060a790c44ed67a77039e7916d41efe8f00d SHA-256: 379554e4acd805241ba6cbecb8db779df5e2f66f3d7fff7399af6312ef06b159
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/pify?keyword=physics+for+scientists+and+engineers+4th+edition+randall+knight+pdf+free In PDF document text
    • http://files.effectivemortgage.com/uploads/1/3/1/4/131453431/3003c6901.pdfIn PDF document text
    • http://files.alma-leather.com/uploads/1/3/1/6/131606984/wuvigifigiwenit_bepelitutiki.pdfIn PDF document text
    • http://files.kmmauthor.com/uploads/1/3/1/8/131871614/7291f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc791ff-b4b1-46d4-8e68-4c427fe6c5ba/30840314163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7eaeb4-bc11-45d5-98f3-140e4d03974d/71841646876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa0dd57-d500-415d-8fdf-b3c9050e3a56/xujofifepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1158/7752/files/karifiwexovake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5250/1658/files/tofazutexagoraterefivir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1388/0483/files/ccnp_official_cert_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8885/5459/files/relational_model_schema_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5533/0966/files/shark_tales_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cca6f043-a569-458e-a8a9-dad0d488e99b/finin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6372c80e-a4f7-4a16-ab02-8f65fdcea218/99569441511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5b8bf1-d6f8-4067-b54c-bbe00a53cba2/buxopuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e1969f-f19b-44f2-a492-802f15610123/durisexoresumanug.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ABE 5672 bytes
SHA-256: 61ac495143af46ffd44d022e6512728d37b6fc8915b3f07f236cd04eb8460f42
font_01_sfnt_off0000ae1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1D 10316 bytes
SHA-256: 12cd06377bd0a745c93c3bad3f5a3e59bab3927521dd53055960680211fefd18

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