Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac954bf9326ad35…

MALICIOUS

PDF

46.1 KB Created: 2020-07-27 11:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb06fba1be91758ef5edfb2fe0c9b5e5 SHA-1: b2b44f59180db642888a82386eb653c352c5d65f SHA-256: 5ac954bf9326ad357e78d5ed2b99c37b998aa4d6e4337d1ce37116a953f822eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to 'Brawl Stars', suggesting a lure to attract users to click on the malicious links. The ML classifier also strongly indicated maliciousness.

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=brawl+stars+ios+android+crossplay
    • http://files.bellaalaf.com/uploads/1/3/2/6/132683484/pidonupod.pdf
    • http://files.drjohnnylee.com/uploads/1/3/2/8/132814589/vimor.pdf
    • http://files.support.easy-editor.com/uploads/1/3/1/4/131453725/2bf38a13f4.pdf
    • http://files.cottonmouth-records.com/uploads/1/3/1/4/131453402/6630705.pdf
    • http://files.rachelyuengaetz.com/uploads/1/3/1/4/131406717/4186768.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/lojupipesojomowegixonejap.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/zobew.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/98280212753.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/fomokeletilonuxavetidokun.pdf
    • https://cdn.shopify.com/s/files/1/0437/7290/3585/files/ziwoxilapogidotofobaseji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6915/3181/files/11694363717.pdf
    • https://cdn.shopify.com/s/files/1/0439/3733/3406/files/kobuzukezasidadonokal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87745409623.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/zosux.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/74716258921.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/75956752904.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3402/files/mavejipedekitivexuraxunar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45865267400.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077b9.bin
561e142a2fa767e2cd2d417991782471805ba595170b78b781e14fd91c610c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B9 4980 bytes
font_01_sfnt_off000088bb.bin
9be75a6d7b7c5371e5ac063dc45272ad8dd603d8d79a1c8bd935015be524529a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BB 9960 bytes

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