Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5ad6619dee1bf5…

MALICIOUS

PDF

54.7 KB Created: 2020-08-16 15:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feeb2415cf297c3979c07eb1689b363e SHA-1: 104809ac10942f0873b5679567f1d89960797c20 SHA-256: 6e5ad6619dee1bf5815c024f4070694455a92efd3c573fff206adad8e7b48810
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm designed to manipulate search engine rankings. One of the primary links, https://ttraff.ru/pify?keyword=balls+game+app+android, is identified as a malicious redirector, likely leading to further malicious content or phishing pages. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=balls+game+app+android
    • http://sabivibo.despinaphotography.com/uploads/1/3/1/3/131379578/wivesegir_vamutebewot_bopirufulomopub.pdf
    • http://files.childrenofthekingdom.net/uploads/1/3/0/8/130873902/8047379.pdf
    • http://files.prestigesupport.org/uploads/1/3/0/7/130775506/2844708.pdf
    • http://lakokaze.nextlinedesigns.com/uploads/1/3/0/7/130740522/6479128.pdf
    • http://files.sciencesnail.com/uploads/1/3/1/4/131408415/46695b71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/muxabunawunixozizuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/1186/5751/files/swashbuckler_rogue_5e.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/85974365792.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/avatharam_movie_tamilyogi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7210/files/brother_mfc_9330cdw_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/mathematics_puzzle_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/3184/5271/files/20503113352.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12086745869.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/lurumamodipumo.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_off00008b87.bin
8f224fa7d57e26e7f8ddc785cd0444ddc23dc171b87b82d73bd32e3de0f002c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B87 5036 bytes
font_01_sfnt_off00009c7b.bin
d7f530648ab0d2bafdeddcb1bfaefb8360fa3ae5615d8e53b0ded2c7d02a3e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7B 10364 bytes
font_02_sfnt_off0000c002.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC002 4324 bytes

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