Malicious PDF — malware analysis report

Static analysis result for SHA-256 18821e2994c790cc…

MALICIOUS

PDF

44.6 KB Created: 2020-08-08 20:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40473893f07932ec80efd688a15775f SHA-1: 1a71cf86524f641f2d5b6574235c29c86290f2b8 SHA-256: 18821e2994c790ccbc438dad58bb92359f31d2f0280c5ef5da6b9f951c0f89a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one identified as a malicious redirector, disguised as educational content. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure 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.cc/pify?keyword=ncert+chemistry+book+for+class+11+pdf+download
    • http://files.longford.coralleisure.ie/uploads/1/3/1/3/131383743/pasalefewo-jozawo-zufurewogexom.pdf
    • http://jagiwo.apicintermountain123.com/uploads/1/3/1/4/131406286/golujusadug.pdf
    • http://files.growersmarket.org/uploads/1/3/1/0/131070450/feruwabovaz.pdf
    • http://files.threegracescoffee.com/uploads/1/3/1/1/131163658/metedexapusejudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6331/1513/files/ielts_writing_task_2_download_free_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedapefe.pdf
    • https://cdn.shopify.com/s/files/1/0439/5424/1694/files/zidagarifupumusesijix.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/sagumogujef.pdf
    • https://cdn.shopify.com/s/files/1/0431/1190/7488/files/cbse_math_textbook_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9869/files/mysql_syntax_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5666/files/to_love-_ru_darkness_season_2_uncensored.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/buluxujaximetukeso.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2837/files/tonejalevuzofilanironozu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2351/3238/files/bigawomimerofaxuko.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/mumutemeduvofujinagumuxij.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/ruzoberaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0769/5258/files/cadbury_nigeria_annual_report_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000613e.bin
e03a6a39b20e136eff0763b4ba2dc4a256bf5f17c95a690d4191b57ed446b00d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613E 5600 bytes
font_01_sfnt_off00007434.bin
32c87af55611b3ce588cf1f22cf7115ba8f92260f306d273daeeb8bc958b5d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 10208 bytes
font_02_sfnt_off0000971a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x971A 4324 bytes

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