Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfac3a4c914f5ef4…

MALICIOUS

PDF

45.6 KB Created: 2020-08-13 02:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52b882e44a616ea1855a7d79df21eedb SHA-1: 7079231c35ceb0ffdd8816a307787333a7554f03 SHA-256: dfac3a4c914f5ef415a1985560c3464de6e9d3268e67c1d9643fd63dcbf909b3
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains text related to 'electronics objective questions and answers pdf', suggesting a lure to disguise the malicious links.

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=electronics+objective+questions+and+answers+pdf
    • http://files.caloundracameragroup.org/uploads/1/3/0/7/130776016/406f294aa.pdf
    • http://files.kimgibbens.com/uploads/1/3/1/4/131482931/rusavadosaziw.pdf
    • http://wadejafik.moment-of-clarity.org/uploads/1/3/0/7/130776612/nadazekotokat.pdf
    • https://cdn.shopify.com/s/files/1/0440/5988/5733/files/koneni.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/vezumovizakowof.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/95327564722.pdf
    • https://cdn.shopify.com/s/files/1/0430/3742/5813/files/30078822147.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/mugopoxolasetegiboromoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/3920/3229/files/84963815486.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99594865370.pdf
    • https://cdn.shopify.com/s/files/1/0437/6576/0151/files/4061065626.pdf
    • https://cdn.shopify.com/s/files/1/0435/9507/1651/files/les_nourritures_affectives_boris_cyrulnik.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/6312815972.pdf
    • https://cdn.shopify.com/s/files/1/0435/0859/6900/files/32216627155.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/cascade_and_cascode_amplifiers.pdf
    • https://cdn.shopify.com/s/files/1/0440/8963/9077/files/xatofikomuwabi.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_off0000732e.bin
132e3d77ccbd82523e0d60e90d882ff50a928cf68bfffcab665f3bd70cce8e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732E 5600 bytes
font_01_sfnt_off00008658.bin
eaa04069df05be68c5c99aaec45cf9865575ebf8437bc006b6e729341e23d749		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8658 10304 bytes

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