Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ed7bb569e9fb92…

MALICIOUS

PDF

45.0 KB Created: 2020-08-10 03:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8be0f0eb35e49b9c722c36955fa71dae SHA-1: c81de012da612021138ead7d7ffbffbb39f30205 SHA-256: 85ed7bb569e9fb9247bf5f2cc95c515a0b56b7837d8097c281fd30814c3ebad9
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a redirector service. The document body suggests a lure for 'punctuation worksheets for grade 6 pdf', but the primary heuristic indicates a malicious redirector link. The file is likely part of an SEO link farm designed to drive traffic to malicious sites.

Heuristics 3

  • 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.
  • 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=punctuation+worksheets+for+grade+6+pdf
    • http://files.tippwheelers.net/uploads/1/3/2/6/132682681/b0215d5.pdf
    • http://files.nonclinicaldoctors.com/uploads/1/3/1/1/131164250/1794057.pdf
    • http://kobejob.mitzlafftrading.com/uploads/1/3/1/6/131606069/kokijezu.pdf
    • http://files.fringedbenefitsdesign.com/uploads/1/3/0/7/130740127/4539935.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/gajag.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/bifuzov.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6657/files/kafozorobetexewufasu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/24141166884.pdf
    • https://cdn.shopify.com/s/files/1/0433/8099/8302/files/hindu_calendar_vikram_samvat_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/xupuzidinepujavadipob.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3765/files/turemabijugogevudevuru.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5181/files/ninebezovok.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/gnostic_bible.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/64605653642.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/54336629265.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_off000063a1.bin
7edc3243221e053b017a09ce24e254c273395a070d6c20c066d8680eeb0f492d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A1 5576 bytes
font_01_sfnt_off0000769d.bin
0154e1c2f02277c12dbb2cba7ead06c3e48923b263699fe89b244ecd6e695d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769D 9996 bytes
font_02_sfnt_off000098d2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98D2 4324 bytes

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