Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb4799234335e33…

MALICIOUS

PDF

52.4 KB Created: 2020-10-09 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bba808241fc2d98d25381d94700077a5 SHA-1: d8c2fb4d18bf00279e20b0556440dedde126fea0 SHA-256: 1bb4799234335e3353f95bb053a1d687c6b6544939c2b3bbce51ea0db40b0a40
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to external PDF documents hosted on various domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious redirector infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests the document's purpose is to create a link farm, likely for SEO manipulation or to distribute malicious content via the linked PDFs. No scripts were extracted from this sample.

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=autocad+2017+tutorial+second+level+3d+modeling+pdf In PDF document text
    • http://files.jbconway.com/uploads/1/3/0/7/130739624/senaw.pdfIn PDF document text
    • http://rinamos.coffeecangroup.org/uploads/1/3/1/8/131872295/xixemusefu-tarisujezi-tuguruzimakuziv-remugu.pdfIn PDF document text
    • http://vogaravo.itwasonmyvisionboard.com/uploads/1/3/0/7/130775565/d5d48.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/95548774299.pdfIn PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/keporerijikigunoveju.pdfIn PDF document text
    • https://site-1038351.mozfiles.com/files/1038351/witebinelomopup.pdfIn PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/14761335376.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/45644093324.pdfIn PDF document text
    • http://files.mifflinjuniataartscouncil.org/uploads/1/3/0/8/130814100/bab00e32fb8da61.pdfIn PDF document text
    • http://titige.bourgeondelavande.com/uploads/1/3/2/6/132681411/9443408.pdfIn PDF document text
    • http://files.responseplumber.ca/uploads/1/3/0/8/130813095/9112044.pdfIn PDF document text
    • http://musof.playfullpotential.com/uploads/1/3/1/0/131070381/kudokiruvoj.pdfIn PDF document text
    • http://files.stephenmwalsh.com/uploads/1/3/0/7/130775231/simepukap-gikolumezofatu.pdfIn PDF document text
    • http://sixifimeb.isaiahinstitute.org/uploads/1/3/2/8/132814930/d157f.pdfIn PDF document text
    • http://wojuwi.southjeffersonrescue.org/uploads/1/3/0/8/130874063/eec398.pdfIn PDF document text
    • http://files.matthewcshuman.com/uploads/1/3/1/8/131856224/rofexivalo.pdfIn PDF document text
    • http://bufik.ultimatepalestine.com/uploads/1/3/0/7/130739996/vinabo-tafavaviro-vunapam-wesut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6613 12228 bytes
SHA-256: 4be012b3c90974d84de73f90c0b6a23bf00c4b59075176348f34bbc3bd2e1157
font_01_sfnt_off00008e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E36 6096 bytes
SHA-256: 93b1a235a4f2420793a88752a57c8fe2bfccdec9e10f173eed9650cad8fa31e8
font_02_sfnt_off0000a2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2F0 9660 bytes
SHA-256: 8b0a15c0da144d7a1a67d193765949189a7c926fd38dc471cb12205710b6609f

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