Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f78fd4e7e95f21…

MALICIOUS

PDF

61.5 KB Created: 2020-08-07 15:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c2eb9d9222890ab56a7723553570cd1 SHA-1: cec5dd5176a6b41ed7d64f92d87518308c54ddc5 SHA-256: 51f78fd4e7e95f213e8f71dd49efb6cf6a7192215684355006292bae1ca9b397
120 Risk Score

Malware Insights

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

The PDF file contains multiple external links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'reading comprehension passages book pdf'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The file is identified as a PDF, and the presence of external links suggests a phishing or social engineering attack vector.

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.com/pify?keyword=reading+comprehension+passages+book+pdf
    • http://files.iprawa.net/uploads/1/3/0/7/130740187/wetakaruvod-zelerex-lekodubib-fizovesoter.pdf
    • http://garopejo.orderlypackrat.com/uploads/1/3/2/6/132681579/c8f889.pdf
    • http://files.arthurmdoweyko.com/uploads/1/3/0/7/130775145/walerexedi.pdf
    • http://files.zippiteeshirts.com/uploads/1/3/1/4/131406831/jivaziziposa-rozisofi-jegaje.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/7045626901.pdf
    • https://cdn.shopify.com/s/files/1/0440/7069/9160/files/donevotelujegejilo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/mizuponelopamawepada.pdf
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/harley_davidson_golf_cart.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/70115725760.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9685/files/adobe_pdf_converter_software.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/62165122450.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/rukakebefip.pdf
    • https://cdn.shopify.com/s/files/1/0449/2469/8791/files/articles_test_pre_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/boranunugalovibezexupo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44368867506.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/58330384713.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_off0000a489.bin
b763603c52ae3879799df64c1f678f49f08d0e1b5490067d20a145bc98a39bbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xA489 5456 bytes
font_01_sfnt_off0000b6d5.bin
1dd06fba30a2e83011150f909adc437efc16ccacb2dbb29f4f9ceccbe404110c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D5 10408 bytes
font_02_sfnt_off0000da5d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 4324 bytes