Malicious PDF — malware analysis report

Static analysis result for SHA-256 d656f84f120c8887…

MALICIOUS

PDF

41.1 KB Created: 2020-11-06 22:04:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18ae76693888223ca33dc0a3f42eae65 SHA-1: 771f4f62df3c91785983ffdc06270c4c22c15442 SHA-256: d656f84f120c8887b0eb06a42864071c41c9dad397d4aab11782a4b69fa28a9a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on services like Weebly, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a potential phishing or malware distribution attempt. While no scripts were extracted, the presence of numerous external links and the malicious redirector strongly suggest the document's purpose is to drive traffic to malicious sites.

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://cctraff.ru/123?keyword=gse+iptv+app+download
    • https://kutepazibug.weebly.com/uploads/1/3/4/4/134477769/nowaxasar_xabapiv_dedel.pdf
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/1009015.pdf
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/kiramodejidin_supezamalo_sezeguw_vogux.pdf
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/mipusulajanewe.pdf
    • https://demogevofowa.weebly.com/uploads/1/3/4/6/134608938/9003090.pdf
    • https://talogaxuzule.weebly.com/uploads/1/3/4/5/134596774/6915582.pdf
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f89096427b3a.pdf
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5f8fce7e03c48.pdf
    • https://nozitobolilijaz.weebly.com/uploads/1/3/4/4/134473425/pifal.pdf
    • https://gosasomaf.weebly.com/uploads/1/3/4/3/134370397/mugafosum.pdf
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/5332292.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bugutaj/beamswork_timer_instructions.pdf
    • https://s3.amazonaws.com/felasorarabipis/83433449070.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062d0.bin
7cd4e003c52b447e9eac0f743b8623dc48be2510491e5065680e478c3ff07506
pdf-font-stream PDF embedded font (sfnt) at offset 0x62D0 5040 bytes
font_01_sfnt_off00007425.bin
14bf73c3e6fbfd50cb62a413f122531ffd13993284dcc9a7cb0023781aec15b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7425 10492 bytes