Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d9c8850f7c5db8…

MALICIOUS

PDF

43.3 KB Created: 2020-08-18 19:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05598003acb575075fdbae213acb92be SHA-1: adb161149f0a13b178fa2a780467784b5011dab8 SHA-256: 83d9c8850f7c5db881ef571738852a11e053cb65ae3c728a96490e5d4ee6dc15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to `https://ttraff.com/pify?keyword=context+clues+worksheet+for+high+school`, which is identified as a malicious redirector. The document's structure and the presence of numerous external links suggest an attempt to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=context+clues+worksheet+for+high+school
    • http://files.staggerapparel.com/uploads/1/3/1/6/131607777/3682843.pdf
    • http://files.globaleducationmove.com/uploads/1/3/1/8/131871874/juvagumowos_warekojapep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/2324/3176/files/jibapa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0523/files/basic_accounting_ratios.pdf
    • https://cdn.shopify.com/s/files/1/0440/4792/5413/files/concerto_for_2_violins_in_a_minor_rv_522.pdf
    • https://cdn.shopify.com/s/files/1/0440/0952/1317/files/puwupapusudagidigaxom.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0263/files/36352317969.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/pumajoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/speaking_activities_for_esl.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/soreluseloxajakikolo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/7338276097.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0700/files/30834372447.pdf
    • https://cdn.shopify.com/s/files/1/0434/6619/5106/files/datevuf.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb8.bin
2cea622037eb9043d2b3c21149978a8aad4e29c01fb6a1104a0cf56b9f5e9e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB8 5060 bytes
font_01_sfnt_off00007007.bin
95398a111708079a796f601eae2c9803870aaac9d3a80d2da885c9d5e7aa678a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7007 10036 bytes
font_02_sfnt_off00009232.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9232 4324 bytes

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