Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5271ca542a3328…

MALICIOUS

PDF

43.4 KB Created: 2020-08-13 22:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dba6dc1e9adba68de5579b06404baa27 SHA-1: 5abbcb4ea4bcd74c70e275d9f50473ba5001bd21 SHA-256: 1d5271ca542a3328272001c6a7126033d40d3483dbb2cc5c277cf8abb98fe83e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=annamalai+university+chidambaram+online+application+form'. Another critical heuristic indicates a PDF link farm, suggesting a tactic to distribute malicious content or manipulate search engine results. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains fragments of the URL and text related to an application form, reinforcing the lure. No scripts were extracted from this sample.

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/pify?keyword=annamalai+university+chidambaram+online+application+form
    • http://files.agentsreferralnetwork.com/uploads/1/3/1/3/131398131/latalivadov_xubexowubit.pdf
    • http://files.bernardcassiere.fi/uploads/1/3/1/6/131606003/sitexano.pdf
    • http://files.abbyvolcansek.com/uploads/1/3/1/4/131437474/kifodobevu_jojatodiwewip_riwukifepoda_seraniperefebiv.pdf
    • http://lovek.opmetoc.com/uploads/1/3/2/7/132710621/2611d7f041.pdf
    • https://cdn.shopify.com/s/files/1/0431/9140/2660/files/wcf_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0433/4072/6427/files/radiation_hormesis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/68134079065.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/wunonapusele.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8383/files/wafutuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/1602/7303/files/cuentos_cortos_en_ingles_de_terror.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3695/files/vepefapunizimasudenuxol.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/free_monthly_budget_planner.pdf
    • https://cdn.shopify.com/s/files/1/0435/7170/8065/files/punutu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9430/9019/files/html_background_color_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/84783745629.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/pinuro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/96516400158.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_off00006a78.bin
e9f3ebff8590454a075d70bfd2546ef0dc41a7c2e361c9b4180670c73d04665c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A78 5684 bytes
font_01_sfnt_off00007da3.bin
1570a2d55973b919796a1e637a04db805d4ba84392b0c36d19a838caa887327e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA3 10120 bytes

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