Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b1ad5766f5ae7d…

MALICIOUS

PDF

36.8 KB Created: 2020-10-02 06:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9f4e8f410b0f33007336c068adef4db8 SHA-1: fa0dbb55f865eb57c050f91f2c9d58a72370e28c SHA-256: e0b1ad5766f5ae7d6a38365f16a3646b83877d32462a62957848bbda863f9104
224 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to SEO-optimized URLs on disposable hosting. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=maa+durga+mantra+in+hindi+pdf, which likely serves as a lure to further malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cctraff.ru/strik?keyword=maa+durga+mantra+in+hindi+pdf In PDF document text
    • http://files.panoramiccave.com/uploads/1/3/2/6/132695328/deforilosus.pdfIn PDF document text
    • http://rufodori.sankaraodisha.kannoli.net/uploads/1/3/0/9/130969475/9644049.pdfIn PDF document text
    • http://files.charlescityelectronics.com/uploads/1/3/1/4/131408537/dovalosufefajev.pdfIn PDF document text
    • http://nogajozo.oaklandcabinetcoatings.com/uploads/1/3/2/7/132740930/rerawejamuvemap.pdfIn PDF document text
    • http://bovinile.nepscholarshipfund.com/uploads/1/3/1/4/131408024/fimope.pdfIn PDF document text
    • http://rimoz.runnersrelief.com/uploads/1/3/1/4/131438572/xakof.pdfIn PDF document text
    • http://fotuv.stellamarisenvironmentalresearch.org/uploads/1/3/1/8/131872048/sivopene-sanebagezaruj.pdfIn PDF document text
    • http://files.wheelhousetheater.org/uploads/1/3/1/8/131857198/707da4f937.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/1/0476/1478/7740/files/free_download_newest_movie_hd_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6449/4742/files/zarilunokub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/60780974406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/dreams_about_flying_snakes.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_off0000479d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x479D 4904 bytes
SHA-256: 42f2dd07055f50fa9ef136757a879f2947993170e1832d95837a16db96d14de3
font_01_sfnt_off0000580a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x580A 9472 bytes
SHA-256: 8cf54b6d2e94ae221b3339a9c9b80c569452ae460adb6dacb8e907e0720729e0
font_02_sfnt_off00007883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7883 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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