Malicious PDF — malware analysis report

Static analysis result for SHA-256 100b44b9ff0e9bb2…

MALICIOUS

PDF

50.4 KB Created: 2020-08-31 05:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d800b96de4c89049db693ea6e62afe7 SHA-1: 744e661651ee502b0aaad417fd5126096aefba8d SHA-256: 100b44b9ff0e9bb2c6ddea47437c16f583dd1bfddff8fbc0a5583e798e873362
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=tomos+moped+models'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and embedded URLs point towards a malicious document designed to redirect users to harmful sites.

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.ru/wix?keyword=tomos+moped+models
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4528/9112/files/lanatiwogawew.pdf
    • https://cdn.shopify.com/s/files/1/0434/9729/1942/files/acrobat_reader_viewer_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/zenot.pdf
    • https://cdn.shopify.com/s/files/1/0437/3574/4673/files/sublime_text_build_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8514/files/69483546660.pdf
    • https://static.usrfiles.com/ugd/d902bb_8dba73b21523467caea98772516f80f1.pdf
    • https://static.usrfiles.com/ugd/5ecadc_d644b27792964dca92e43d9230dd6fad.pdf
    • https://static.usrfiles.com/ugd/ade4e6_95241b682bcd42c5955815eef969c86d.pdf
    • https://cdn.shopify.com/s/files/1/0465/1453/6598/files/enrique_tabara_et_ses_oeuvres.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5230/files/52151513415.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/75087116682.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/59758621372.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/certificado_medico_cruz_roja_toluca.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3751/files/ielts_full_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/examples_of_ethical_dilemmas_in_nursing.pdf
    • https://cdn.shopify.com/s/files/1/0437/2270/2999/files/associao_de_resistores_em_srie.pdf
    • https://cdn.shopify.com/s/files/1/0447/0718/4793/files/75356407476.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_off00007369.bin
ede8005a9c5b487eb62a2c7b920e541f766b65ac1ec320c7187c29ddf29bebf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7369 4304 bytes
font_01_sfnt_off000081fd.bin
32d47f98f6d6eeed645dd951099653d9301b3eda2e874d9e653dc4efe9fd0449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81FD 14184 bytes
font_02_sfnt_off0000ae22.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE22 4324 bytes

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