Malicious PDF — malware analysis report

Static analysis result for SHA-256 11064390664a222e…

MALICIOUS

PDF

45.0 KB Created: 2020-08-25 10:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 702d317f3e872940eccb848390e476a3 SHA-1: 4ac476a3c8067426733f4bd8bd66387ca2c2f8f4 SHA-256: 11064390664a222ec0985112d21748b56d03d83b53ec3c6c311aa1ef1603dcb7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms and a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. This suggests the document is designed to drive traffic to malicious infrastructure, likely as part of a phishing or SEO scam.

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.cc/pify?keyword=extra+long+staple+egyptian+cotton+sheets
    • http://files.msbutchersclassroom.com/uploads/1/3/1/4/131406841/vofawojolu_vodovatuf_gakisaxezoxem_kuzozuluzenubi.pdf
    • http://files.kylefackrellmusic.com/uploads/1/3/1/4/131407625/bf3b7a4990.pdf
    • http://files.crwlodge.com/uploads/1/3/0/8/130813042/mejomiwe-komejorijulusif.pdf
    • http://vadirudu.seesparkles.com/uploads/1/3/1/4/131453858/8383939.pdf
    • http://files.encyclopediasonica.com/uploads/1/3/1/3/131398195/4094484.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0444/8436/2407/files/math_expressions_grade_5_volume_1_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/byte_array_to_file_java.pdf
    • https://cdn.shopify.com/s/files/1/0430/4922/2298/files/pupajexijejoxotuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7350/files/57857649793.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/205641461.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/liridule.pdf
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/93690104996.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/houghton_mifflin_math_grade_3_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/7470/7868/files/pitumakekukopu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/vojojajavizanobitu.pdf
    • https://cdn.shopify.com/s/files/1/0445/8296/1311/files/vizio_sound_bar_and_subwoofer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1637/1867/files/rejulot.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6973/files/xoxojutew.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_off0000709f.bin
cd9b751091f3db044d226305f04b9d2d7c9164bae2f9ccd48fa4a4455f8c728a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709F 5324 bytes
font_01_sfnt_off000082c1.bin
b25973b89893403e8fd341bfcfbb8b2fa796179c5eface794f0402dfeaae2de7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C1 10428 bytes

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