Malicious PDF — malware analysis report

Static analysis result for SHA-256 96b5b5d9c577d712…

MALICIOUS

PDF

43.1 KB Created: 2020-08-08 05:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a6cbd5af499bbc63ee3bb427178522c SHA-1: 370ef4d0666615dc8bf1ba274edda734cb40a98a SHA-256: 96b5b5d9c577d7128185c071f3a2a200b7e071cbe69ab279d2feb2a6170082a7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=george+bridgman+libros+pdf'. This indicates the document's primary purpose is to redirect users to malicious content. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and lure victims. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.ru/pify?keyword=george+bridgman+libros+pdf
    • http://files.learningthroughteaching.com/uploads/1/3/0/9/130968917/448936.pdf
    • http://files.hadassahcalligraphy.com/uploads/1/3/1/4/131453399/1590691.pdf
    • http://zokezi.politetemplebaptistchurch.org/uploads/1/3/2/6/132696030/65777.pdf
    • http://files.divimar.com/uploads/1/3/0/9/130969562/a1267cfcd1ec2b7.pdf
    • http://files.woodyshticks.com/uploads/1/3/1/3/131379612/ritozo_luwubuvilul_bizifodoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7248/files/boxoxuxibegoxom.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/subutumavibubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/40679607332.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/menilaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/29715186227.pdf
    • https://cdn.shopify.com/s/files/1/0449/4455/6187/files/java_generics_templates.pdf
    • https://cdn.shopify.com/s/files/1/0438/2998/5430/files/biblia_hebraica_stuttgartensia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94260126358.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/texogakewefovodig.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/wamusuzalilugaguxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/88340018998.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/66534546698.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_off00006a8b.bin
ff5308543a0a6e8d049a0d09dcd58ddfe7317d6a10178f91b3e6c0922e72bb76
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8B 5532 bytes
font_01_sfnt_off00007d41.bin
67a1757b472aaa5619a0cf8fd31fe94779607b8e7583c3c669684db701b2ce80
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D41 10216 bytes