Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9efa80e151e40f…

MALICIOUS

PDF

40.1 KB Created: 2020-08-11 16:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36f7079791b322d6df6c52c927b959ef SHA-1: 2d29147e8166bd395752c511a6b0367b406ca602 SHA-256: 0f9efa80e151e40f6236690493266e305eaac318bd20e7f7a5fd79bfcb82b443
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though partially corrupted, includes text related to 'area of polygons worksheet pdf' and the malicious URL, indicating a lure to disguise the malicious intent. The presence of many external PDF links further supports the classification as a link farm, likely for SEO manipulation or to distribute malicious content.

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=area+of+polygons+worksheet+pdf
    • http://files.mmsoundandlighting.com/uploads/1/3/1/4/131438891/3064463.pdf
    • http://files.castleworksmotorsports.com/uploads/1/3/0/8/130814283/1326886.pdf
    • http://zebevur.lillyannetr.com/uploads/1/3/1/4/131406532/doxudomuzo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6464/6042/files/67403315197.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/jefutozaxadoxogulusu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/small_txt_to_excel.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/rutotagofoturojukigokedoz.pdf
    • https://cdn.shopify.com/s/files/1/0444/2734/6086/files/tesis_de_calderas_pirotubulares.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91337380597.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/19703974934.pdf
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/bebuxulogakikavex.pdf
    • https://cdn.shopify.com/s/files/1/0436/8033/3989/files/bivaluveforarukutu.pdf
    • https://cdn.shopify.com/s/files/1/0441/0654/7352/files/mike_tyson_s_mysteries.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/the_battle_of_agincourt_sources_and_interpretations.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_off00005e05.bin
458eb654c210f1ae42f45a1d61533e9abfddddfa688d9d53020321b3057d377c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E05 5552 bytes
font_01_sfnt_off00007101.bin
24d1b3ef5233381dfda5345d84be90b8438dd8c39f4c929de9a073a7c907f223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7101 10180 bytes

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