Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd39a5c8ac7e6a9…

MALICIOUS

PDF

46.1 KB Created: 2020-08-17 13:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aa2f6bf395fe4f5d94de75c35a46c84 SHA-1: 9cce5a2d1060fe77bdd556bb025d4c253bcf04bc SHA-256: 6cd39a5c8ac7e6a9039923f5861a499e06cdb6645b68a2d46141e5325852e090
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious URL identified is https://ttraff.com/pify?keyword=algebra+1+chapter+7+test+answers, which is presented as an answer key. The presence of numerous links suggests an attempt to generate traffic or distribute further malicious content.

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=algebra+1+chapter+7+test+answers
    • http://bekalusis.nahomiichino.com/uploads/1/3/2/6/132681579/forawufijakefizob.pdf
    • http://files.editmythesis.com.au/uploads/1/3/0/7/130775252/8942222.pdf
    • http://wozug.erica-barlow.com/uploads/1/3/1/4/131452839/filasam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wajumibuxup.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/85108612601.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/81679905018.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1185/files/eenadu_news_paper_telugu_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/0361/6165/files/sebibino.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0433/7850/7934/files/26383604461.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4171/files/topefo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0683/4334/files/gwthar_bodo_film.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/hands_on_automated_machine_learning.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/al_quran_dan_terjemahan_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/11972536542.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_off00006884.bin
7d0e249a382ec3732b2102b1dd44188444c1ae109a133f93de45088d44969ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6884 5180 bytes
font_01_sfnt_off00007a2d.bin
6b1cf0a20be2804ceca08bafbcc19563dac47391a1af8c5a972b18501fe10069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2D 10316 bytes
font_02_sfnt_off00009d61.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D61 4324 bytes

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