Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfcc86a376d06dc…

MALICIOUS

PDF

45.9 KB Created: 2020-08-24 19:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81de3e042af1ebbceb92e84bc5f6d685 SHA-1: 070824332aa0e53c9e29c8ccbb0b688cfb6dc167 SHA-256: 6cfcc86a376d06dc7f31c230d381470479d1d9684a4425493304d0ad524158c3
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.ru/pify?keyword=3d+photo+facebook+android'. The document body, though heavily obfuscated, contains this URL, suggesting a lure to a phishing or scam page. The presence of numerous external PDF links further indicates a link farm strategy, likely for SEO manipulation or traffic redirection.

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=3d+photo+facebook+android
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdf
    • http://files.youthdigital.com/uploads/1/3/1/8/131871477/butojafes.pdf
    • http://files.socceriqeducation.com/uploads/1/3/1/6/131637374/a990ea207a8378.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/candide_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/46651208326.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/39076531583.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/pigebufujumaduminuvubul.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8988/files/kezorulixemilapajexil.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/siboguwuxote.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1376/files/xivakibu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/lidenefu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1186/5751/files/www_blackanddecker_com_newowner.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/rabenifedaniwajukuxuko.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/9712411999.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/formation_excel_2020_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9834/files/44095353920.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006451.bin
19d2f7155ca0b211909e7188f29578626afedd59f82546e17aaf51e3f8d5cdad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6451 5304 bytes
font_01_sfnt_off00007642.bin
da03112ccb1b14f4347d389367c9ad43d2a13086af6407d343aee66ae7e06c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 6336 bytes
font_02_sfnt_off000086f6.bin
d9850c6a385518696248f02b5837e0f154c1d1bfcca3c69110244ae22b2aaaa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F6 10388 bytes

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