Malicious PDF — malware analysis report

Static analysis result for SHA-256 c686adf8b6e8acad…

MALICIOUS

PDF

37.9 KB Created: 2020-08-21 22:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 824af74c8e8ad4c889713f6a7f1586e9 SHA-1: b176e139cc22574ea10e3d0717a0a355b3a8eda6 SHA-256: c686adf8b6e8acad2b6cb7dee2a9bc99b410e747b84f18a2da6db27ca3520b86
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate educational resources, but one of the primary links redirects to a known malicious domain. The document body, though heavily obfuscated, contains the text 'Openstax calculus volume 1 solution manual' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF also contains numerous links to shopify.com, likely part of a link farm to improve search engine ranking for malicious content.

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=openstax+calculus+volume+1+solution+manual
    • http://files.axeskiphire.co.uk/uploads/1/3/1/4/131438427/pimarimamitik-zadaxulawo-rorafid.pdf
    • http://files.pigolin.com/uploads/1/3/1/4/131438018/sebixesevorib_zoxorojitopon_terufutozojon_dilix.pdf
    • https://cdn.shopify.com/s/files/1/0434/4466/6529/files/98724602191.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0220/files/microsoft_system_administrator_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/suwexusizutedukamuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17232613021.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6558/files/pixubefoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/56399105970.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/taromap.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/93381117824.pdf
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/62513999797.pdf
    • https://cdn.shopify.com/s/files/1/0437/5999/2990/files/baan_enterprise_resource_planning.pdf
    • https://cdn.shopify.com/s/files/1/0432/4088/2340/files/fiwerunemuwunof.pdf
    • https://cdn.shopify.com/s/files/1/0429/2263/9527/files/91529361429.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/kaxurirelirujupi.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_off000054b3.bin
39cd6ea702c0aae2ff7e2e765b6e1cbc767f331a590608b7c4c732a50092d80c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B3 5188 bytes
font_01_sfnt_off00006652.bin
241e081dc6dfe8b9a1424ae47e6ed382444d8a214b34ecb22bed109cd3afbc09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6652 10608 bytes

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