Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1ceebb6676410b…

MALICIOUS

PDF

42.9 KB Created: 2020-08-19 00:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed829545c0df2abb8141358ae5956cd8 SHA-1: e6c470e1dc1532ef53a57001b1bf0eb7c457a665 SHA-256: 8d1ceebb6676410bc246492e2cf86bcab27c153cc3773c4d41cfaafaaf3a06d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a malicious URL, masquerading as an 'Irish passport application form'. This is further supported by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the target URL and references to passport applications.

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.com/pify?keyword=irish+passport+application+form+child+uk
    • http://files.campchow.net/uploads/1/3/0/7/130775565/jafafewibozobajiset.pdf
    • http://deses.jennydocherty.net/uploads/1/3/1/3/131380550/seroxukov.pdf
    • http://files.sacredheartwebbcity.org/uploads/1/3/1/4/131438259/13e27f5024a7.pdf
    • http://zepesi.aseatatthetable.org/uploads/1/3/0/7/130776208/zovazi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/2952440102.pdf
    • https://cdn.shopify.com/s/files/1/0433/1637/9816/files/tigelix.pdf
    • https://cdn.shopify.com/s/files/1/0441/0903/7720/files/barriers_of_entrepreneurship_development.pdf
    • https://cdn.shopify.com/s/files/1/0435/9087/7339/files/kazexepomudel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/zekegoxepuzidabu.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/mugazifefodo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4707/3445/files/kivegazotisaserepodeni.pdf
    • https://cdn.shopify.com/s/files/1/0438/0616/3104/files/html_utf-_8.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/6446808734.pdf
    • https://cdn.shopify.com/s/files/1/0437/3879/2085/files/266123835.pdf
    • https://cdn.shopify.com/s/files/1/0431/7829/5450/files/tekafenamovutijifaji.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aac.bin
0a9bca63ff60f657c9b3da3b25f190a6c2517c06729cb9758b7eed1d3c70ffbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAC 5396 bytes
font_01_sfnt_off00007cce.bin
9ed082454185994e26d4c6355e1a128055b436702925880b830d296efd50db2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCE 9948 bytes