Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f470e5fd6a992b…

MALICIOUS

PDF

77.1 KB Created: 2020-08-03 17:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9259b48ddb39b26524712d08517a2774 SHA-1: 687af3c63eff8daa6464f465e9bce0c48dc22bb1 SHA-256: 16f470e5fd6a992b527e39dbc3a65d8e4c4b28f2f5b82d163cef213cf7f67718
154 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a malicious advertising network, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL which is also listed as an IOC. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm operation, likely for SEO manipulation or to distribute malicious content.

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/wb?keyword=silabario%20hispanoamericano%20pdf%20gratis
    • http://files.northhaledontreeexperts.com/uploads/1/3/1/3/131380875/3091327.pdf
    • http://files.northshorehomes-seaside.com/uploads/1/3/0/7/130740190/limanuzugiv-kefigi.pdf
    • http://files.genesiseventsinc.com/uploads/1/3/0/9/130969469/8579880.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/jikozogal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6854/files/ponuzedokumawukekar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0432/7827/0619/files/fomazipogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/e5_ae_8b_e8_8c_9c.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/vuxudovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2019/7789/files/mawor.pdf
    • https://cdn.shopify.com/s/files/1/0433/9594/0519/files/77350475767.pdf
    • https://cdn.shopify.com/s/files/1/0433/3446/7752/files/nexaxop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zexula.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/mafikawalupoz.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/4887720065.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_off0000e61a.bin
d9c1c171641028ff717b66a609141a7fb90241018bd1179d4a6ca1f070d61bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 5812 bytes
font_01_sfnt_off0000f9b5.bin
fc74b4d2ed56a7e21ffe2d892ffcf416b61d8739ac391d325e9d8e0f2ea8b85c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 14300 bytes