Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc049a1a18402090…

MALICIOUS

PDF

49.6 KB Created: 2020-08-20 13:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c693b9a47f67c82cca1f3feeccdb2287 SHA-1: 5953ab54113c6960590a6a8b1260c9b81bb56e23 SHA-256: bc049a1a1840209040c8c523d6c228f57df305f9dfb832c5be84ffd9767f01d1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass link farm, with a prominent link disguised as 'Class 10 seba social science answers'. This link redirects to 'https://ttraff.cc/pify?keyword=class+10+seba+social+science+answers', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links pointing to various PDF files, suggesting a lure to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=class+10+seba+social+science+answers
    • http://files.sebastopoltalentshow.com/uploads/1/3/2/7/132740275/naropar.pdf
    • http://files.thrivingdrs.com/uploads/1/3/0/7/130776204/5770433.pdf
    • http://repuliluk.mymariavictoriawtx.com/uploads/1/3/2/7/132740585/tomivabotovorubado.pdf
    • http://kabak.chrisball-student.com/uploads/1/3/1/0/131070894/1672640.pdf
    • http://babamibi.nemslax.com/uploads/1/3/1/4/131406285/73722991d.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/auto_focus_camera_app.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1448/files/98687617367.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/86376112457.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/bluegrass_stockyards_lex_ky.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/63758157240.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/zigevugabed.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/communication_networks_leon_garcia_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/ejercicios_isometricos_abdominales.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0647/files/eva_foam_sheet_white.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_off00005da8.bin
1aed08ced07ed0e8e5b1a4584814cbafe891cea8f0801d5c4b4490c90e255506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA8 5124 bytes
font_01_sfnt_off00006f2c.bin
612fd618a132b1ff802569b1e7f265ffe7b3e5226225ce0dd43c277fbef5c377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2C 8996 bytes
font_02_sfnt_off00008c17.bin
3457676cb2011668529c830aec44afa0264ae81f377d50a63b5ce84aeb0f4ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C17 14536 bytes

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