Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb688cff9ebd5aa…

MALICIOUS

PDF

43.6 KB Created: 2020-10-14 06:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c8ebd2f1960a8140fa95140538b95b6a SHA-1: a899ff82f3f317bf5c119178e9026ab205170567 SHA-256: bdb688cff9ebd5aa740943e567e4a71bde75c97e0dd27438f393cd3906a0a8e4
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 of which point to known malicious redirector infrastructure or link farms. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/strik?keyword=division+practice+worksheets+7th+grade', suggesting a lure to trick users into clicking malicious links. The ML classifier also strongly indicated maliciousness.

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/strik?keyword=division+practice+worksheets+7th+grade In PDF document text
    • https://site-1037026.mozfiles.com/files/1037026/rilibenevip.pdfIn PDF document text
    • https://site-1038510.mozfiles.com/files/1038510/wazapazekapunigasamizemi.pdfIn PDF document text
    • https://site-1036731.mozfiles.com/files/1036731/paxuwiropamu.pdfIn PDF document text
    • https://site-1040785.mozfiles.com/files/1040785/kufexakegujawinumirofavi.pdfIn PDF document text
    • https://site-1042892.mozfiles.com/files/1042892/79061795045.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/18ad995.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1109957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7142/9021/files/nokuruzepoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3676/5079/files/febreze_allergen_reducer_fabric_refresher.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2238/4793/files/falling_creek_park_trail_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2659/1139/files/robes_of_xin-shalast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/7503/1206/files/into_the_groove_lyrics_glee.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_off00006ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC2 5600 bytes
SHA-256: 9a211e7ee566f891eb77b12797dae2e0b883404cdecf565b29de0aaeaca0c3fc
font_01_sfnt_off00007de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE1 10280 bytes
SHA-256: 1fcf79c440043765993361f58340f8d4c9e85bd95721aded9e73b94b5d5dc59b

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