Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b7ac9817e1fa11…

MALICIOUS

PDF

47.7 KB Created: 2020-08-10 04:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9202e7c6d0256e7cca3912c04c439716 SHA-1: f89040e3887677711072db953010f6a5a54e5177 SHA-256: 20b7ac9817e1fa1185a084ca5eca37a7212dbdb8e22057c53ed77a25b2e08c0b
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the target search query 'bergey s manual of systematic bacteriology volume 4 pdf' and the malicious redirector URL, indicating a lure to a potentially malicious site.

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.com/pify?keyword=bergey+s+manual+of+systematic+bacteriology+volume+4+pdf
    • http://files.carburettormagazine.com/uploads/1/3/0/9/130969190/potatagupejekiga.pdf
    • http://files.hellovetmed.com/uploads/1/3/0/7/130739225/netubofogavowawov.pdf
    • http://pusevozal.askdocta.com/uploads/1/3/1/0/131070450/6647606.pdf
    • http://files.rehobothconcertband.org/uploads/1/3/0/7/130775309/zireju.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/fosasuzesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8327/files/maharashtra_mba_cet_2020_result.pdf
    • https://cdn.shopify.com/s/files/1/0429/0494/4807/files/55979596087.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/salesforce_attach_to_email_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/56651379595.pdf
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/xogimaguzijak.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/history_of_biomass_energy.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/deutz_allis_9190.pdf
    • https://cdn.shopify.com/s/files/1/0434/4292/9821/files/dorudoxafim.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0428/files/poludazokusoxivot.pdf
    • https://cdn.shopify.com/s/files/1/0435/2969/9482/files/code_clicker_heroes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7961/5142/files/michigan_fight_song.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_off00007b81.bin
000ab417a8d31091988b483902d02d8e5c1cf795e9e39e3a89f04dd9edfae72b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B81 5916 bytes
font_01_sfnt_off00008fa5.bin
135dce1635bf4e6a8c562c0412a817b0498100b64c4461b7195706f75492bcd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA5 9908 bytes

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