Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdefbfd8f753389…

MALICIOUS

PDF

49.7 KB Created: 2020-08-23 14:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de4956bbe8e8eb05ea8c5223f6cfff2d SHA-1: 2ad376bc561213c4dc9001395f33e69e277ecca0 SHA-256: 1cdefbfd8f7533892d398269f7cc95b2bdc77b614ae32d96e67bb6685a7faf1a
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=android+listener+from+activity+to+fragment', which is also listed as a malicious redirector. The file also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=android+listener+from+activity+to+fragment
    • http://files.mastermindandbrain.com/uploads/1/3/0/7/130740053/2132990.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/12640913405.pdf
    • https://cdn.shopify.com/s/files/1/0448/1345/1430/files/akuntansi_biaya_edisi_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/zevuvosatoja.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/35401941500.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/story_map_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/93944597309.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/payback_period_calculation_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/4478141396.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/wojirij.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/45010641636.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/dark_empire_trilogy.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/26421483976.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000601c.bin
62b49990aa14c4f4f5462568fceb3778ce78bb63f9db109c046d94cc1a1593c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x601C 5492 bytes
font_01_sfnt_off000072b2.bin
3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B2 2140 bytes
font_02_sfnt_off00007c8c.bin
46c2c0457f176d2f8d5bca2931907411691a2cebca898a96c894759f40d7000f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8C 10564 bytes
font_03_sfnt_off0000a0c9.bin
bf192b1231e9900984b7ead4524f82f7d6fd5788873c200c445560301f5d5eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C9 16664 bytes

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