Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecff24923b0d7208…

MALICIOUS

PDF

38.8 KB Created: 2020-08-31 00:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db88aaed0f77788930ba69e1d51a3bda SHA-1: fd24569a6aaaab22776eb07d8b81fdb7cad99fe8 SHA-256: ecff24923b0d7208ca7f11ea24dc6bbf5ff8153ca41dc19c8038fd57cacbb115
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.com'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to PDFs hosted on Shopify. The document body contains the string 'It's a ghost ball' and the malicious URL, suggesting a lure or redirection mechanism. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=it%2527s+a+ghost+ball
    • https://cdn.shopify.com/s/files/1/0434/7474/7558/files/70384792672.pdf
    • https://cdn.shopify.com/s/files/1/0446/7779/1897/files/spanish_numbers_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0462/1539/7530/files/japotiweketubunatuxix.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7841/files/amilcar_cabral_livros.pdf
    • https://cdn.shopify.com/s/files/1/0462/3165/0453/files/html_gmail_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/miwizasimegetipujeraz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4066/8838/files/jazodifamutofaroweluvijij.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9799/files/42001610215.pdf
    • https://cdn.shopify.com/s/files/1/0437/7555/7793/files/peking_duk_state_of_origin_performance.pdf
    • https://static.usrfiles.com/ugd/b8c837_40f6f4ca71f74898a515a2598ec36831.pdf
    • https://static.usrfiles.com/ugd/078c79_8949298d460d4a02b3122d0f21c038c7.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13121593915.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/24740681145.pdf
    • https://cdn.shopify.com/s/files/1/0437/6834/8830/files/82648527841.pdf
    • https://cdn.shopify.com/s/files/1/0434/1678/0951/files/36957469202.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_off00005b99.bin
79dec1128fac58bafd37a5dc99ed3fe5339632dd851ecd20a3cd21ced613e931
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B99 4960 bytes
font_01_sfnt_off00006c78.bin
d7b84f7cd31246c1e8a26891c795b008cadd00986e5580d90e44c65338fc4ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C78 10060 bytes