Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0afa8e985310721…

MALICIOUS

PDF

49.1 KB Created: 2020-08-10 19:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 352d358530609f7f9720bec5a0ae6749 SHA-1: 218a49135ed519444033d70d1ff711626c2c2c74 SHA-256: f0afa8e985310721b34acd72eae2a873221cfed525f5164c8f081f55eeb51532
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=maharashtra+state+board+12th+information+technology+book+pdf, which likely leads to further malicious content. The document body, though heavily obfuscated, contains references to educational material, suggesting a lure to disguise 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.cc/pify?keyword=maharashtra+state+board+12th+information+technology+book+pdf
    • http://files.worldginsengherb.org/uploads/1/3/0/8/130874205/kelemonomo_gefegetuv_ferudoja_faxemu.pdf
    • http://raxarak.bringalessiahome.com/uploads/1/3/1/8/131871721/zuzozusovesezax_pojufodafebegig_mulakibijuwulaw.pdf
    • http://tepowaf.mrsmoothbeatz.com/uploads/1/3/2/8/132816202/vulipulelifu_vokijuwedaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8876/4316/files/pod_hd500_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0726/files/bootstrap_3_offset.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/xugutuwujoxem.pdf
    • https://cdn.shopify.com/s/files/1/0435/8704/3496/files/affirmez_vous_fanget.pdf
    • https://cdn.shopify.com/s/files/1/0434/8461/0712/files/vezenewekixevusigevenulus.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/wuxomafiv.pdf
    • https://cdn.shopify.com/s/files/1/0454/8037/8518/files/69407647461.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3381/files/66641261747.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6967/files/52623491976.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/24966494386.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9384/files/71562459113.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/21980511722.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_off00006263.bin
b423eb21d408a8e57e1f274054e6cea2e6273ddb9ee9e14e4dc1b0e5be7ea9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6263 6064 bytes
font_01_sfnt_off000076ed.bin
0714ed34fffbaf894267bb70e2cf3031185a9500d61a6cb5476ac83a75481c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76ED 10080 bytes
font_02_sfnt_off00009996.bin
9129b07219a88e4dd205854105c89d15cc2d6812ebb1f876bf6f9aaef4dc9ead		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9996 8748 bytes

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