Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1ba8f5ff737231…

MALICIOUS

PDF

48.3 KB Created: 2020-08-12 00:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ea5bc019d9d9f6f2dfbe059025edab SHA-1: 57c0568ed19764417f75c1f720b7864b44358967 SHA-256: 5d1ba8f5ff737231b2af67d6a307f868207f73fa3068b975c5eb6f6f3a75a8a8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead users to harmful content. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the malicious URL and text suggesting a lure for 'act practice test pdf mcgraw hill'.

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/pify?keyword=act+practice+test+pdf+mcgraw+hill
    • http://files.classicfinancialsolutions.com/uploads/1/3/0/7/130776483/wuzukupego.pdf
    • http://files.furnacemountainzen.org/uploads/1/3/0/9/130969300/2030815.pdf
    • http://xugepag.strandeddog.com/uploads/1/3/1/4/131483337/xizamibipivijomufife.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/29899614098.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/81432672673.pdf
    • https://cdn.shopify.com/s/files/1/0431/5126/1853/files/68168868099.pdf
    • https://cdn.shopify.com/s/files/1/0448/2806/5949/files/como_converter_em_dwg_autocad.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/xowamavexidodedetereg.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/muvizefusegusagovujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5462/9015/files/jowoxidotubagatugerivilex.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/61862894598.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/xewobegesegawokotow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9384/files/murivivigarofoseribefowu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/magic_8_ball_responses.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_off000076a9.bin
b6ea0fdbe549e4523d6449a7ad359360225016f67a38ecdf109e9caef335ce7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A9 5652 bytes
font_01_sfnt_off000089c8.bin
1cf17fc6420b6ac02c7296233f1a40f8ee36d3afedaded45aaaec889cca100a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x89C8 13396 bytes