Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e505ca326af9ed…

MALICIOUS

PDF

34.6 KB Created: 2020-08-12 15:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfc9b64be8afdc1c799e1751ab895c5d SHA-1: 94761d93a0793b0ca83f05c39bb596dfd8e841dc SHA-256: 71e505ca326af9edb1c7df5a913b3640b7acf73b7b1f56226961c88025be71b8
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at `https://ttraff.com/pify?keyword=aday+%25C3%25B6%25C4%259Fretmen+kitab%25C4%25B1+2020+pdf`. This suggests the document is designed to lead users to malicious content, likely for phishing or malware distribution. The presence of many external PDF links also indicates a link farm strategy. No scripts were extracted, but the embedded URLs are sufficient evidence of malicious intent.

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=aday+%25C3%25B6%25C4%259Fretmen+kitab%25C4%25B1+2020+pdf
    • http://files.gmf.ch/uploads/1/3/2/7/132740723/gakemaliwan.pdf
    • http://files.priscillabe.com/uploads/1/3/0/9/130969680/8686148.pdf
    • http://files.boardgamebase.com/uploads/1/3/1/4/131406800/5803928.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/dht11_start_condition_1_not_met.pdf
    • https://cdn.shopify.com/s/files/1/0433/8427/5109/files/lee_loadall_2.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7051/files/virabudiginikugupej.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/alcoholismo_causas_y_consecuencias.pdf
    • https://cdn.shopify.com/s/files/1/0439/4939/2030/files/buvemuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/anatomy_books_for_artists_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/69233027053.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/bukizok.pdf
    • https://cdn.shopify.com/s/files/1/0429/8938/7935/files/nutricion_antienvejecimiento.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/5239078689.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/nirajuzajemomodofamutijak.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/65998256633.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_off0000456e.bin
5111ba5743823384f08c630128a161d56a8159e19b64b25c384bfcd91e01c78a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x456E 5948 bytes
font_01_sfnt_off0000596f.bin
77c8047dae38a9dcb5b9d4ab0e5b248636490eb0c0db06449ed62f67eb94a72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596F 10940 bytes

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