Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4cf8f8dd4dc716…

MALICIOUS

PDF

48.0 KB Created: 2020-08-12 12:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 260a418791a37ef8a587d94beba6150c SHA-1: 12281946e2f6fe965f9a888702852eb19f6ddda9 SHA-256: ba4cf8f8dd4dc716972ddb93040515603e26661c116a5a703d6f7362027adb1d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many of which are SEO-optimized to appear as legitimate document downloads. One prominent link, 'https://ttraff.com/pify?keyword=bardale+forensic+medicine+pdf+free+download', redirects to known malicious infrastructure, indicating a phishing or malware distribution attempt. 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.com/pify?keyword=bardale+forensic+medicine+pdf+free+download
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdf
    • http://files.goldcoastcreatives.com/uploads/1/3/0/7/130775892/muxaj-wojavibode-buneboturoton-kazum.pdf
    • http://files.rsitoy.com/uploads/1/3/2/6/132695697/deboxabuku.pdf
    • http://sadazegi.slytactraining.com/uploads/1/3/2/6/132682883/lavajipamezegi.pdf
    • http://files.conceptjoineryinteriors.co.uk/uploads/1/3/0/9/130969448/22cca.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/59750922476.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/99068265105.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/gail_howard_lottery_master_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/is_wondershare_mobile_transfer_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/1579/7917/files/50075186148.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7142/files/310861055.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/kuronodedoragenisimo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/52901954696.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/rexetagotukegitozu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/84033097418.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070cd.bin
7ce550d3a37170605f51c8aa766b327939e44d4f9ba1367ae51d8d9c2bd87f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CD 5148 bytes
font_01_sfnt_off0000823e.bin
7197c09bffa185ceb8b3f5bb86af42b819ef39bf21270dfc46c6c70a8e552e19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823E 10144 bytes
font_02_sfnt_off0000a4e3.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E3 4324 bytes

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