Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d5a98847657fb9…

MALICIOUS

PDF

63.0 KB Created: 2020-08-14 04:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a231589e3e5ffa96bcfdb84dea413f6 SHA-1: 4a0d5c0fcb5c215488d1676ba18ba78303a62c32 SHA-256: c0d5a98847657fb90f47efe43ba70553c0af2f0f0ba5d0cf2733b0abcf0af2f8
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the text 'Tally erp 9 study material in gujarati pdf' and the malicious URL, suggesting a lure to download or access malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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/wb?keyword=tally%20erp%209%20study%20material%20in%20gujarati%20pdf
    • http://muvegumu.entropicj.com/uploads/1/3/2/3/132303382/0d9352692638625.pdf
    • http://files.christinelanphotography.com/uploads/1/3/0/7/130738790/gamurowunarabeloxu.pdf
    • http://files.artspacenj.org/uploads/1/3/0/7/130740231/7858065.pdf
    • http://files.becomeyogi.com/uploads/1/3/1/4/131438161/paxetumik-zerodulefivafo.pdf
    • http://files.dontworryaboutme.com/uploads/1/3/0/9/130969003/wuziragutilejabajob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pegegezanonipilupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0726/files/81095245860.pdf
    • https://cdn.shopify.com/s/files/1/0435/6587/5359/files/interview_techniques_in_journalism.pdf
    • https://cdn.shopify.com/s/files/1/0437/9164/6880/files/rotujiwemoberuzikamamuze.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/human_development_in_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0437/1018/5637/files/banner_health_logo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0174/0439/files/negevibitaxuxe.pdf
    • https://cdn.shopify.com/s/files/1/0441/1038/1208/files/engulfed_cathedral_debussy.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/pabijin.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/judazedaniramexa.pdf
    • https://cdn.shopify.com/s/files/1/0444/3511/2103/files/namakam_chamakam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3556/5978/files/wizard101_mod_menu.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_off0000b568.bin
8af3f4ab0e877a038378137feeb146bb10b5ea5694c419eacde4040da12ad32d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB568 5644 bytes
font_01_sfnt_off0000c895.bin
83353ed5ff1343c8c6d242f46518d09d628cfc1456ba8171109d7ab3b6bea7b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC895 11204 bytes

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