Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8786f69d7c5e5fa…

MALICIOUS

PDF

39.0 KB Created: 2020-08-25 16:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5077a9c892c5a7644abfa7a8d6b0f98 SHA-1: 6c8b56ac68ec63aa87f5a3113889a482efb00be5 SHA-256: a8786f69d7c5e5fad90a5e617ea8e82cc17247818652b6a307b806805f9ab7a2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL, 'https://ttraff.ru/pify?keyword=assassin%2527+s+creed+game+apk+pure', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Assassin's creed game apk pure', suggesting a lure for pirated software. The ML classifier 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=assassin%2527+s+creed+game+apk+pure
    • http://files.connallyband.com/uploads/1/3/1/8/131856381/koguwoxixude.pdf
    • http://files.abwamdcap.org/uploads/1/3/2/6/132681556/1741901.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/23706553966.pdf
    • https://cdn.shopify.com/s/files/1/0463/1688/0029/files/android_mod_games_new.pdf
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/66043507089.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/neoplasia_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9173/files/acupuncture_points_chart_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8254/7361/files/capsaicina_beneficios.pdf
    • https://cdn.shopify.com/s/files/1/0431/5738/9472/files/71128234216.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/12665678042.pdf
    • https://cdn.shopify.com/s/files/1/0429/3338/7420/files/ahmednagar_police_bharti_2020_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0428/7302/8775/files/28687052112.pdf
    • https://cdn.shopify.com/s/files/1/0430/5495/6695/files/31539194031.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9018/files/27638585733.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/84812193694.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/diaphragmatic_breathing_video.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d50.bin
c28663b598a40004f6b52b63de46f63d4081f6c7b23474cc6055e338c3187d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D50 5140 bytes
font_01_sfnt_off00005ea3.bin
f2ae7c0005b9c5d8b04551ac40c0d71c8def7e348d344e9562d02610716f7609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA3 10024 bytes
font_02_sfnt_off000080f5.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F5 4324 bytes

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