Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d561212a6ee39af…

MALICIOUS

PDF

39.3 KB Created: 2020-07-23 11:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fac9f5d34fd0964d406c7d7df0819cb5 SHA-1: 3b9becf079a540000868f27d91e1839598dceb21 SHA-256: 7d561212a6ee39af5ef50893bbfa286c1aac98a0be3856126c8cbb0550f91034
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful destinations.

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=binomische+formel+aufgaben+klasse+8
    • http://files.hoveyeyres.com/uploads/1/3/1/3/131378852/mojelax_vesiwebat_bupobozobimizu_vanedobadagu.pdf
    • http://files.vintagevibelou.com/uploads/1/3/1/4/131453451/1044873.pdf
    • http://files.alexandramcintoshlaw.com/uploads/1/3/1/3/131379594/203508.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/boreseketakepitanerez.pdf
    • https://cdn.shopify.com/s/files/1/0437/8247/1837/files/jujejuxupefoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/disosamogibo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/15353694410.pdf
    • https://cdn.shopify.com/s/files/1/0437/9938/0130/files/81669217578.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/vanis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/63257385329.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/395667921.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/mamabowo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0098/files/jufulewarexiwolamu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8982/9800/files/xomuniguvujojigo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/38438113125.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_off00005893.bin
d778c1d64ffb516ab2978da6ef4292a1471f14a33977d28ecad6d8886aff3b56
pdf-font-stream PDF embedded font (sfnt) at offset 0x5893 5544 bytes
font_01_sfnt_off00006b31.bin
a29414acce8ba8652d7142340c980f2fb12ed18601b0411cb8285a058870bbbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B31 10732 bytes