Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79f8d897bcdb623…

MALICIOUS

PDF

120.9 KB Created: 2020-08-07 00:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b842bcb2e1a71da9056db12ec6b79be7 SHA-1: 6809d7462364ded4578f5d12c728b97d06c528b1 SHA-256: c79f8d897bcdb6231a76dd4d18c8de2f8f1dc163a746c718503cfb369746136b
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=business+environment+pdf+m.+com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one to 'https://cdn.shopify.com/s/files/1/0433/6081/3208/files/georgia_armenia_azerbaijan_lonely_planet.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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=business+environment+pdf+m.+com
    • http://files.ascofbc.com/uploads/1/3/1/0/131070151/9243802.pdf
    • http://xagamanur.norwicharcheryclub.com/uploads/1/3/1/0/131070872/kogejoxuxosu.pdf
    • http://files.closetluxeboutique.com/uploads/1/3/1/8/131856743/a1d276.pdf
    • http://files.ardsleyeducationfoundation.org/uploads/1/3/1/8/131857315/8862880.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/georgia_armenia_azerbaijan_lonely_planet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3283/8298/files/zinixolezagod.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/77691159690.pdf
    • https://cdn.shopify.com/s/files/1/0435/3546/6655/files/88309247177.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/7440904194.pdf
    • https://cdn.shopify.com/s/files/1/0433/4456/0281/files/rezuzidutasadogujumil.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/79767340859.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/banatudurajofesulixod.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/static_gk_capsule_study_iq.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_off000193a9.bin
aa9de95bccfc7f5e7b9607cfbe2590ae8007faad728c7fe7689831b855245e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193A9 5200 bytes
font_01_sfnt_off0001a559.bin
2932896a31acf1303fb57eae76d83d2050e9d37395388caede2f6e36ec2939c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A559 15628 bytes

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