Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91877e07fb34c47…

MALICIOUS

PDF

48.5 KB Created: 2020-08-19 05:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c87465889e4509199da679f22ff2f335 SHA-1: 1411244b744b872379903d51714d7aeba3a7ef70 SHA-256: b91877e07fb34c47a3d528ccca03b22ca7062de4bf76d3c044fe97fcbaeddf34
152 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL https://ttraff.com/pify?keyword=biology+questions+and+answers+on+cells is a primary indicator of this malicious intent. The document body, though partially corrupted, contains text related to biology questions and answers, likely serving as a lure to disguise the malicious redirection. The ML classifier also 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.com/pify?keyword=biology+questions+and+answers+on+cells
    • http://files.parkviewfortpierce.com/uploads/1/3/1/4/131437685/3083125.pdf
    • http://tolevore.iwaswarned.com/uploads/1/3/2/3/132303382/jolewixinosemafetedi.pdf
    • http://mipowi.lcooperillustration.com/uploads/1/3/1/6/131606027/a6a950b2e7.pdf
    • http://pifaf.lawrencevilleroofingco.com/uploads/1/3/0/7/130776659/5788464.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/fakanekipugereronej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0432/1938/6526/files/viwaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/7th_grade_math_workbook_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/facebook_page_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/2699/7663/files/kevusedojefi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/414295279.pdf
    • https://cdn.shopify.com/s/files/1/0438/0252/5856/files/scert_sams_odisha_gov.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/cambridge_english_proficiency_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/gisuxop.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_off00006c37.bin
5ca1503723f34e06a9ef04a573b8ab5d9f7bc1e38850cc493a674bbb58904b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C37 5356 bytes
font_01_sfnt_off00007e82.bin
07531e2e4d5469b2318cdc42a93a4088be5e5b87aa0b4b94d01f09b3e1de915d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E82 12816 bytes
font_02_sfnt_off0000a71e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA71E 4324 bytes

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