Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8edbb6f41698cd…

MALICIOUS

PDF

42.4 KB Created: 2020-08-25 09:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86278c7ea877002ccd378d5108c0b306 SHA-1: 1ac8d28fd57dc1e91a4ed12e662cad0f5ac25737 SHA-256: bc8edbb6f41698cdc6f1f63d71243dcda8eaac31b29f9f7fd2e7ac99a96e0527
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 of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru', which is presented in the document body as a 'balancing equations worksheet part 2 answer key'. This indicates a social engineering lure to drive traffic to malicious infrastructure.

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=balancing+equations+worksheet+part+2+answer+key
    • http://files.myadminonthego.com/uploads/1/3/0/8/130874148/wusozokanivuj-vidoboziriso-wopanu-borobov.pdf
    • http://bemuvuma.pslhsband.com/uploads/1/3/1/4/131437709/ed1454bd39ce77.pdf
    • http://files.shamanmods.com/uploads/1/3/1/3/131379724/9a8a4b1707ddbbf.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/xopiwadekifew.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9792/files/algebra_1_common_core_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/hardest_naruto_quiz_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/82763756762.pdf
    • https://cdn.shopify.com/s/files/1/0434/2703/7336/files/10th_tamil_sura_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/occupational_health_and_safety_act_regulations.pdf
    • https://cdn.shopify.com/s/files/1/0438/4181/4693/files/jubidomivaradutazox.pdf
    • https://cdn.shopify.com/s/files/1/0436/0860/4829/files/51516680100.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/estructura_del_texto_argumentativo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/axis_allies_d_day_rules.pdf
    • https://cdn.shopify.com/s/files/1/0433/3754/7929/files/aa_acceptance_prayer.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/vewikofo.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_off000063ae.bin
3ebf66d54b072f91674a822bb447d70999e6d7b90096c989f37f3f067b43d554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AE 5760 bytes
font_01_sfnt_off0000775b.bin
9fd65df51de9c6864de091f559689c0d4b5e50375b7fe23f8f9454e0cbefb140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 10924 bytes

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