Malicious PDF — malware analysis report

Static analysis result for SHA-256 8addc79fb21e43d3…

MALICIOUS

PDF

35.9 KB Created: 2020-07-12 05:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 217ad7cf605d23d3a27535ffe2ea2436 SHA-1: 285a6f3f75dab0f8ab341cbbfb96460c65c94a36 SHA-256: 8addc79fb21e43d39c5857a9ea27f7b815ee72e7ade6d8c8e951edd7d74e5f0f
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search engine results, with one critical link pointing to a known malicious redirector. The document body text, though garbled, contains the same lure text and the malicious URL, indicating an attempt to trick the user into clicking the link. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=prem+ratan+dhan+payo+torrent
    • http://files.hamptonshousewife.com/uploads/1/3/0/7/130739069/sigib.pdf
    • http://files.moipu.com/uploads/1/3/0/7/130776008/6207851.pdf
    • http://files.andrewjgoggans.com/uploads/1/3/0/8/130813417/67532e8.pdf
    • https://kolebifi.files.wordpress.com/2020/07/zokukoz.pdf
    • https://nezirirotur.files.wordpress.com/2020/06/guvajumujawetifimamimuwor.pdf
    • https://biresorinodi.files.wordpress.com/2020/07/lafitanigizafewemowobip.pdf
    • https://dexemibur.files.wordpress.com/2020/06/dasazatajopejat.pdf
    • https://vimolor.files.wordpress.com/2020/06/vebademenotetifivow.pdf
    • https://luragekid.files.wordpress.com/2020/06/92370083218.pdf
    • https://rafebuputaj.files.wordpress.com/2020/07/jegenogumixafosan.pdf
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/21424274512.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/4849569666.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/wamajonikivirolitowibi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lenibokufilitixesokan.pdf
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/27677619474.pdf
    • https://cdn.shopify.com/s/files/1/0431/0656/6306/files/92131543184.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.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_off00004fc6.bin
dd866abca90d8fecd1aacc2cce7946b08e08262171021fb464fd4dc66637d38d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC6 4832 bytes
font_01_sfnt_off00005ff3.bin
71a3f76c0438299b522ff722911de8aa03497409b926ccc4268d9c45db0f6fc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF3 10096 bytes