Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebfce921d77d32c…

MALICIOUS

PDF

40.1 KB Created: 2020-08-14 20:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd05ab17aabdd641f661fa10f3af2d0b SHA-1: f4718fe066670007d85d77df0d3c2688bee7ac53 SHA-256: 1ebfce921d77d32c6d7acebfe0ae706fc8b63723d25f72d633e2571dfbbc58e9
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.ru/pify?keyword=acer+aspire+one+netbook+manual`. The document body, though heavily obfuscated, appears to contain text related to an 'Acer aspire one netbook manual', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=acer+aspire+one+netbook+manual
    • http://files.independentlutherandiocese.com/uploads/1/3/0/9/130969656/rosokojepuzefo-lasuguzekibegut.pdf
    • http://files.stjamesbands.com/uploads/1/3/1/3/131379113/wujalapatiweb.pdf
    • http://files.victor-connections.care/uploads/1/3/0/8/130813841/tevulegupem-pogumage-maxatusosuxaj-lezopejexin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/18589027659.pdf
    • https://cdn.shopify.com/s/files/1/0438/7323/9195/files/79599382869.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/89697142796.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4028/files/lefumawukobepibozufimiza.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0992/files/html_games_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1558/files/41532201307.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/tebutawupalusofive.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/28384625413.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/mdcat_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/99602528154.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/96364094975.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_off00005d05.bin
828a1b7c00b5833fea33be28208ee450cda679c863e19781d16cd99f0f34a15c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D05 5272 bytes
font_01_sfnt_off00006ed0.bin
0856350baf0d3b331a1b79a96722d1835fc9383ccbc2b7be5e1ab7be24fbe0cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 10372 bytes