Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf5b947734e86ae…

MALICIOUS

PDF

36.0 KB Created: 2020-08-23 17:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb857263e5c0ba27ea9f4740ffdeb7bc SHA-1: d40c348fcef9943ee6a4538f48a302a64ccca7b0 SHA-256: 3bf5b947734e86ae70512ca6bfc15f602fc61f105f91e350961c40f3013c9e4a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One prominent link, 'https://ttraff.ru/pify?keyword=designing+brand+identity+pdf+espa%25C3%25B1ol', is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. 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.ru/pify?keyword=designing+brand+identity+pdf+espa%25C3%25B1ol
    • http://files.whatareyoucraven.org/uploads/1/3/1/4/131406068/080a12a.pdf
    • http://wotol.margarettellis.com/uploads/1/3/1/3/131398140/zidomukuputuxizuwe.pdf
    • http://files.runwellbowlsclub.com/uploads/1/3/0/7/130740173/jipakuzeroxisi.pdf
    • http://files.amymoenart.com/uploads/1/3/1/1/131163920/figaraxo.pdf
    • http://files.opticnervearts.com/uploads/1/3/1/8/131872079/tazifim-wodipujisesafi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/martensite_transformation_in_stainless_steel.pdf
    • https://cdn.shopify.com/s/files/1/0434/4755/0119/files/up_b._ed_entrance_exam_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/call_of_duty_aw_emblems.pdf
    • https://cdn.shopify.com/s/files/1/0430/7543/6698/files/hollywood_movie_tamil_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/0593/4759/files/29668959747.pdf
    • https://cdn.shopify.com/s/files/1/0429/4544/6044/files/bokanulepoletarajalomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/timex_marathon_watch_manual_wr50m.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/bogurutesobewizesekiniduf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8726/files/risusufigubiguwake.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/wotaxovapilurutivetokel.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/lavavewuzugimot.pdf
    • https://cdn.shopify.com/s/files/1/0437/1428/1625/files/history_of_all_prophets_in_islam.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c72.bin
98b2b683c60865e175b1b3e47a4d07bba0f8742f8f56237287ec65cf8b6d85de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C72 5660 bytes
font_01_sfnt_off00005f80.bin
d480a2f379877ad3646730ec4d55f042f93f2a43d9426acbe355966905d090b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 9828 bytes

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