Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9f690955370238…

MALICIOUS

PDF

65.2 KB Created: 2020-08-14 20:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0f47b6f1c3bc6ce8be4027347bba913 SHA-1: 63acfab80060c4bd5982ae71e5e05cf8ec92e6f4 SHA-256: 1f9f690955370238f07889c1ae5a61cdc1dcf6a0518c7e8865516840254eaa62
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. One prominent URL, 'https://ttraff.ru/pify?keyword=world+hardest+math+problem+with+answer', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting a lure to a potentially harmful site.

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=world+hardest+math+problem+with+answer
    • http://files.riteinthewild.com/uploads/1/3/2/6/132695492/6170653.pdf
    • http://jamire.lakemurraymontessori.com/uploads/1/3/1/0/131071243/ae636dd.pdf
    • http://files.mymagicbrushes.com/uploads/1/3/0/8/130814100/891898.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/kadaso.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/vebewubifopara.pdf
    • https://cdn.shopify.com/s/files/1/0431/9926/6979/files/trust_and_breach_of_the_psychological_contract.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45560821546.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/tekafuwinijovera.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/cahills_vs_vespers_book_1_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/29984195002.pdf
    • https://cdn.shopify.com/s/files/1/0435/1862/3896/files/capgemini_technical_interview_questions_for_freshers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3348/4699/files/basic_sight_words_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3934/files/susamebeduvudi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/neurological_assessment_nursing.pdf
    • https://cdn.shopify.com/s/files/1/0434/8893/6102/files/ak_interactive_weathering_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/mac_os_x_combine.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_off000099f7.bin
36222da7e35398ffc1ce0a7e54d4eff23fe0ef166eeea304970e49e0d4f94657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F7 5444 bytes
font_01_sfnt_off0000ac70.bin
d52634db95df1b1557c01d4c8e6e3c3549dc3f8484d23db6575561863910a7bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC70 11220 bytes
font_02_sfnt_off0000d2af.bin
8d6695225dc3b038b27642a4494180d5ac21b720f74e731b7da772b7987b308f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 16124 bytes
font_03_sfnt_off0000e79f.bin
ff9cbd7946f30f2b7bbe064772a6115a344c3f976dd6a12c5040da37f7346dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE79F 6068 bytes

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