Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f7251c549dd411…

MALICIOUS

PDF

50.6 KB Created: 2020-10-31 06:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9a51398a6c4020ecc8ab5685b03bbbd SHA-1: 772583305c48da28f950633b5eb160dcee6ca440 SHA-256: 63f7251c549dd411d85ac4a43580c7ff615e0136c293a219bc4306a26ac9747d
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on Weebly, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier 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://ttraff.link/123?keyword=ccsd+2019+calendar
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdf
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/6927930.pdf
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/tujelovobagamotemid.pdf
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/bokamu.pdf
    • https://jixepelisu.weebly.com/uploads/1/3/2/6/132695865/355e35696.pdf
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/ledonokeberuso-kobifebonewen.pdf
    • https://cdn-cms.f-static.net/uploads/4420767/normal_5f9ca4db5aaf0.pdf
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/3096688.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wunupalezozerud/insolvency_and_bankruptcy_rules_2016.pdf
    • https://s3.amazonaws.com/henghuili-files2/alteraciones_de_la_conciencia.pdf
    • https://s3.amazonaws.com/rufonali/tarijokupowu.pdf
    • https://s3.amazonaws.com/ditiruz/28667566094.pdf
    • https://uploads.strikinglycdn.com/files/dd1fec17-b1ea-45a1-b6ba-75b5f13b56c3/44822990316.pdf
    • https://uploads.strikinglycdn.com/files/3477f2b8-4aec-414d-8996-5c5d78850c42/54363469714.pdf
    • https://s3.amazonaws.com/radaruropivoje/altura_ceiling_fan_60.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_off00008508.bin
449d22c26db364a065d21458bd29b2f60592583a765cd63173c63db835344b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x8508 5320 bytes
font_01_sfnt_off00009724.bin
9e83626e7349545b1448b64e4917ced1d738a2d5f14293de51b006a70645f065
pdf-font-stream PDF embedded font (sfnt) at offset 0x9724 11476 bytes