Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad24db2fe45de3cc…

MALICIOUS

PDF

117.0 KB Created: 2020-08-13 22:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df16c0149c80b03263b6c9ec8478ebe2 SHA-1: d4cf0d9f6291a2e0ab1bcb142250b970ae085871 SHA-256: ad24db2fe45de3cca0e50d2995bfc42b100d2620e5b1891638792f85521f7981
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link that is presented as a resource for "Java interview questions and answers for freshers pdf". This link, however, redirects to `https://ttraff.com/wb?keyword=java%20interview%20questions%20and%20answers%20for%20freshers%20pdf`, which is flagged as a malicious redirector. The presence of numerous other links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=java%20interview%20questions%20and%20answers%20for%20freshers%20pdf
    • http://zamepamal.drcarriebrennan.com/uploads/1/3/2/3/132303382/puleguzujomemige.pdf
    • http://lagaril.yamaelegance.com/uploads/1/3/0/7/130740178/xagomefefulel_mudikajodof_kizokadanom.pdf
    • http://files.kaylabegay.com/uploads/1/3/1/4/131453215/1662760.pdf
    • http://lelekopew.mediationguernsey.com/uploads/1/3/1/4/131406121/togenisewi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2376/files/22629572108.pdf
    • https://cdn.shopify.com/s/files/1/0448/6764/9698/files/antares_autotune_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/6078/8390/files/the_data_warehouse_etl_toolkit_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/70875610599.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/18982290813.pdf
    • https://cdn.shopify.com/s/files/1/0431/4572/4055/files/31945076451.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/85981325786.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/nikon_lens_repair.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5971/files/22342828815.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/80979412763.pdf
    • https://cdn.shopify.com/s/files/1/0431/6351/7092/files/empirical_formula_practice_problems_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/how_to_setup_voicemeeter_banana.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/23438456759.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_off00018215.bin
ba4ac4d19fd1dab7e491b5f68f0c2910fcd3ab410983b47e2397112eb6c80a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18215 5364 bytes
font_01_sfnt_off00019461.bin
38c39f840d80f8089e8960329ec35d3ad103d49423409d7d65e7e34c231b0add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19461 15732 bytes

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