Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a84b7e2aad7e675…

MALICIOUS

PDF

39.6 KB Created: 2020-08-31 16:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b768b2742ed7453c560f730620881a7 SHA-1: 75ce6b11c832dd7d719d76c76fa585a0dedaff40 SHA-256: 0a84b7e2aad7e6757f2370dae68c23b4ef51e5b8b2a2d6c7a649c8e94a0f8397
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to appear as legitimate educational resources. One of these links, https://ttraff.ru/wix?keyword=holt+mcdougal+algebra+1+book+answers, is identified as a malicious redirector. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wix?keyword=holt+mcdougal+algebra+1+book+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/77750421237.pdf
    • https://cdn.shopify.com/s/files/1/0437/1523/1895/files/81131440410.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/arya_samaj_marriage_application_form_hyderabad.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/nokebisizuri.pdf
    • https://cdn.shopify.com/s/files/1/0432/8108/8670/files/an_apology_for_poetry.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/spelling_worksheets_for_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0428/4032/6300/files/14621351322.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/puterepidojagetedupi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/don_juan.pdf
    • https://cdn.shopify.com/s/files/1/0432/5667/6507/files/bike_race_game_apk_uptodown.pdf
    • https://static.usrfiles.com/ugd/b3bc21_c890696538a845aaab9342d5012c5e27.pdf
    • https://static.usrfiles.com/ugd/89c6ad_959b6500c9fa4aa4bfea6f8bf9888dd4.pdf
    • https://static.usrfiles.com/ugd/b8c837_17deed89015940d9a6f183a05e92f7a5.pdf
    • https://static.usrfiles.com/ugd/40b9e6_5bbfac2c9af64acfb15e2ff9341302c4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005965.bin
e1f0b2d2ecd0384893c71799e1d75ec45c148290b84743f7cd6ca6ec8e5491cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5965 5568 bytes
font_01_sfnt_off00006c4c.bin
5d678a13b038764cce3125975f0f1425cdaffaf1f9d1266fc6aa2a1b567cd0b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 10928 bytes

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