Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5e60fcdfe16d7b…

MALICIOUS

PDF

37.2 KB Created: 2020-09-30 03:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8453e3bbb0d998fc0963de0b7076b450 SHA-1: e8d7a771750a388d5537c4b3d6a32ac1e3ebe47a SHA-256: 5b5e60fcdfe16d7bb7a08fdfe056d67fe756997ee294b372fc57886ef5462b9c
184 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDF files, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or to distribute malware. One prominent URL, https://ggtraff.ru/strik?keyword=story+central+2+student+book+pdf+free+download, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/strik?keyword=story+central+2+student+book+pdf+free+download In PDF document text
    • http://files.angelpractitioners.com/uploads/1/3/1/4/131437983/pupeso_jerap.pdfIn PDF document text
    • http://xutunisa.gugulethusiziba.org/uploads/1/3/0/8/130814017/nejajalelix.pdfIn PDF document text
    • http://xisuguw.lopezanimals.org/uploads/1/3/0/7/130775379/37be08cb063b790.pdfIn PDF document text
    • http://files.readingstyle.net/uploads/1/3/1/4/131438069/fixuseteg-wofen.pdfIn PDF document text
    • http://zipejisuk.richmondbulldogs.org/uploads/1/3/1/4/131438110/d5edfa380.pdfIn PDF document text
    • http://files.laceramica.studio/uploads/1/3/1/3/131383456/xekeziguma.pdfIn PDF document text
    • http://files.johnharrisonsingersongwriter.com/uploads/1/3/0/8/130874029/6a046e70d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/29053675865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/17239650453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc68e18-4e95-4615-a78c-4c090b847acd/92870356729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c00f949-5703-4d5d-a11b-5abd33e4de1c/93228305371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5269b3f0-d176-4cb9-a964-94485062727c/45970950183.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46E5 5616 bytes
SHA-256: 716edeed3b9504a40af82275db792f46c1ef69377dc1bc61797553a7a7612efa
font_01_sfnt_off00005a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0F 9288 bytes
SHA-256: 14669f3c68d60fd16b67fbf9dd005650d44857e25c311b3cdcc745e144e9e09c
font_02_sfnt_off000079e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2