Malicious PDF — malware analysis report

Static analysis result for SHA-256 7693ca71da945cee…

MALICIOUS

PDF

63.3 KB Created: 2020-08-31 03:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ae41107f7cd4abbfca93b17890d5cf SHA-1: cf865324675a8197aec7aaf9d6fda3de25a19bf7 SHA-256: 7693ca71da945ceea89aff6e96f83a4861cf5da2f19b356cb7e6633bbc1ab91f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other links to Shopify PDFs indicates a link farm strategy, likely to improve SEO for the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=a+modern+approach+to+regression+with+r+solutions
    • http://www.stat.ta
    • https://cdn.shopify.com/s/files/1/0432/0854/0315/files/38354143396.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/3557195387.pdf
    • https://cdn.shopify.com/s/files/1/0460/1076/1377/files/holt_physics_textbook_chapter_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/adobe_audition_2_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/smash_everyone_is_here_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3571/files/pdf_to_word_converter_online_software_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/9559/5938/files/whose_uncle_graphing_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7722/8957/files/72993125121.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/botijefivi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/segmental_anatomy_of_liver.pdf
    • https://cdn.shopify.com/s/files/1/0437/6736/5794/files/55195581632.pdf
    • https://static.usrfiles.com/ugd/accd1f_1be0cb3c91e64eac8cdc4a4243909f58.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_cd0cbc3683ab4f46ba519ec3950210bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1410f3e0148a46feb1339822ff8d32aa.pdf
    • https://static.usrfiles.com/ugd/8b49c6_60552d2d7de84953bc63954ca6bdef83.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d61.bin
ec4de099a65e2fea1b3c52b0e2e6f2fa38ddca6e131a7cacbdddca9e4c733a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D61 20252 bytes
font_01_sfnt_off0000acfb.bin
b7d8bec8318f7da51afb9650cbca4ffd0167ce8ce1acd08a7886fc774907e881		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACFB 5568 bytes
font_02_sfnt_off0000bfc2.bin
a234f438a775e50e8fb2f4cb0dd57f48b6240406ed4e24d4fd6a69e39b2904f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC2 15380 bytes

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