Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fbd371638f802c…

MALICIOUS

PDF

43.9 KB Created: 2020-10-26 05:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bdc309ac3784e0380d3a9af825c2599b SHA-1: 250d5dbbb44118f5b7bb0763044d5d78a8734b37 SHA-256: 70fbd371638f802ce69aa941e2265442aa5255ab2cef78bf8f409b7606375c2b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to a redirector service designed to lead users to malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm and a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to drive traffic to potentially harmful sites, likely as part of a phishing or scam campaign.

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=psychology+101+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f8de424b661b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f94943759772.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/guvefidowaf.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/1150995.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/gapawu-vopijerovefud-jefogolod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nowonovege/ribanevume.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/gokezipavozaduzukoxik.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/92553998272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4779/2021/files/minoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/kyoto_map_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4012/6629/files/call_of_mini_infinity_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/speed_control_of_induction_motor_nptel.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/20091637057.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/geometric_shapes_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c480d099-ae56-4c1f-b7e3-b7753e6c91cf/69192824006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db52c973-ec40-457d-a8df-d71abc42b1af/pamemepusavaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28d96b2-ec36-465b-ba41-cc14436efce9/rezubutobidagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce711c0c-e076-4fde-8a73-0e03f8fa4ff7/24535125069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c29d853-5731-4ec3-8efe-cb8fdfa077b7/gizizulofojoka.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_off00006c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 5408 bytes
SHA-256: 328551d8e2a877dab9677c87907364987be48440ad4be0f08cbacf2d13c5f61e
font_01_sfnt_off00007ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC4 10924 bytes
SHA-256: d4269afefac0f69e48f9220063f7fc7e60420697d3d1fa023d511f7bb8fac9cb

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