Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1963665a7302fb5…

MALICIOUS

PDF

49.3 KB Created: 2020-08-08 05:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df33bac9f07e82478c99a75d2a53cae8 SHA-1: 60c7b4cb1c6057309ebeeeb9c3e5499f459b04e8 SHA-256: d1963665a7302fb5b04c272788279c6c15b57df5e98dfd0256e51cceacd2aa49
154 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 external PDF files hosted on Shopify. One of the primary links, 'https://ttraff.com/wb?keyword=digestive%20system%20worksheet%20for%20grade%205%20pdf', is identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to educational content. The ML classifier strongly indicates 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.com/wb?keyword=digestive%20system%20worksheet%20for%20grade%205%20pdf
    • http://wubis.steam-skills.org/uploads/1/3/0/8/130874284/fobewepage-memopipezixol-dabogidonolo-gulasumifek.pdf
    • http://files.authorkimfox.com/uploads/1/3/1/3/131379612/kemunafejebos_furugamoros_vagububike_wivosoruda.pdf
    • http://files.ccfnei.org/uploads/1/3/1/6/131607310/5878324.pdf
    • http://files.sacredmountainjourneys.com/uploads/1/3/1/8/131856584/e8c72a6a7095cb4.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/matipebegobibodarobuxa.pdf
    • https://cdn.shopify.com/s/files/1/0441/3489/1672/files/edge_barracuda_buggy_plans.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/42644147395.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/stages_of_grief_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/64972751460.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/63697029024.pdf
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/wujatitegigakelogomaputu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/98834040120.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/96269781832.pdf
    • https://cdn.shopify.com/s/files/1/0435/3543/3882/files/affordable_housing_sepp.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/nulldc_unable_to_find_bios.pdf
    • https://cdn.shopify.com/s/files/1/0438/0554/0509/files/nagoguvewijinibimivil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8497/2183/files/pogufubunanemajaralub.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8744/files/wofosinapeb.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/82995973890.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/
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/fil

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008169.bin
9f3e5007f92a710d666252616687522adddd16a1dcfd2bab0732f6f78ce2563b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8169 5864 bytes
font_01_sfnt_off00009558.bin
be1d54800246c162700e02fa323970166e4b737df121468043ad3e39dbea2c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9558 10076 bytes

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