Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a957204a7004c5…

MALICIOUS

PDF

40.1 KB Created: 2020-08-15 02:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7e5947c27599bf3abc158fcc6eebff8 SHA-1: c5f534972bc0bd31acbfa91adfe89651a3a29009 SHA-256: 11a957204a7004c5cdff078a95ed185af317229ea6964177d83e8514e97d4d34
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains text related to an 'assessment form for adhd' and includes the malicious URL, suggesting a phishing or scam attempt. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or to distribute further 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.cc/pify?keyword=assessment+form+for+adhd
    • http://bumijotu.mercyandtruth.com/uploads/1/3/0/8/130874050/e34b4943735d.pdf
    • http://files.louisefristensky.com/uploads/1/3/1/4/131452838/c7fe9.pdf
    • http://files.udmags.com/uploads/1/3/1/4/131407012/3956122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6668/7642/files/kifitasedefosogekudejit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12091312038.pdf
    • https://cdn.shopify.com/s/files/1/0429/0877/8663/files/kimaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5499/files/roloxedolaraborozumelegov.pdf
    • https://cdn.shopify.com/s/files/1/0438/5275/9190/files/29072283662.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/kuduge.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/6477809526.pdf
    • https://cdn.shopify.com/s/files/1/0429/4954/2041/files/burlington_english_for_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/speaking_ielts_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/best_app_annotate_apple_pencil.pdf
    • https://cdn.shopify.com/s/files/1/0429/3459/9843/files/rodney_o_joe_coolie.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_off0000608d.bin
cf39aa24c08fdbd5f6c2c92701d81c809e0d35911112d9001c70092ad9e38a7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x608D 5104 bytes
font_01_sfnt_off000071b5.bin
2b4b852eded21e71acf15bc9000b2a10117a445371080e698a5a2a41d7ca5e2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x71B5 9924 bytes