Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb25b8e19d9600e5…

MALICIOUS

PDF

47.8 KB Created: 2020-08-09 20:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82cb98e7864ae68f52d7184441b54489 SHA-1: fdf9f05753854322aefb9225fda8c62a5fb28bc0 SHA-256: cb25b8e19d9600e50f808f7645e27b59d39cac7a713c490d255a450cb24b028c
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One prominent link, 'https://ttraff.ru/pify?keyword=jumbled+sentences+exercise+with+answers+pdf+for+class+9', is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to 'jumbled sentences exercise' and mentions 'wkhtmltopdf', suggesting a lure to disguise the malicious links. The primary attack pattern involves redirecting users to potentially harmful websites.

Heuristics 3

  • 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.
  • 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=jumbled+sentences+exercise+with+answers+pdf+for+class+9
    • http://nopom.whittierhsclassof1964.com/uploads/1/3/2/6/132682646/c91ea00bff.pdf
    • http://xaduk.jakebirtwhistle.com/uploads/1/3/2/7/132712615/vavefukezisomaf.pdf
    • http://gasosonet.waterandseedhawaii.com/uploads/1/3/2/3/132302780/142d9a343.pdf
    • http://files.onlyifearthmadeit.com/uploads/1/3/0/7/130775098/gedunefofez.pdf
    • http://files.figureitin.org/uploads/1/3/0/8/130814411/jifusawoj-fowefutelukemed-newetosekagi-kekovovuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7274/9721/files/day_trading_and_swing_trading_the_currency_market_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/tawinexirubesojobomive.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3695/files/zoposinekimasefotapuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9820/1502/files/boeuf_bourguignon_julia_child.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0435/5047/4403/files/96939968792.pdf
    • https://cdn.shopify.com/s/files/1/0448/5106/9085/files/94049212802.pdf
    • https://cdn.shopify.com/s/files/1/0448/0276/9053/files/pusha_t_mixtapes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7602/6522/files/6022909986.pdf
    • https://cdn.shopify.com/s/files/1/0434/9516/2022/files/tubadivuxukeri.pdf
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/wigotavagofomulivawuvexap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ee.bin
ca977ff417be00a6f6bd56481f8e526792cbbcd7b894c35195340c8d7c4546aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x66EE 5720 bytes
font_01_sfnt_off00007a41.bin
102683835e6305b8322899969c7c4ad550aa87f6a22ecfe58378c32614dee33a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A41 12948 bytes
font_02_sfnt_off0000a3ab.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3AB 4324 bytes