Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1bb77b0c1d5520…

MALICIOUS

PDF

58.9 KB Created: 2020-08-08 09:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1146ec5e1322aa1104aedbf8f079cc2 SHA-1: 86e0c86a1e38067f7f1383497f2c4f2f6fb30531 SHA-256: cb1bb77b0c1d55204a7b87532f787a94abb57140b345f67f4d639ff141b63ea5
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, creating a link farm. One critical heuristic identified a redirector link to 'ttraff.com', a known malicious domain. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing.

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=conservacion+de+los+elementos+bioticos+y+abioticos+pdf
    • http://files.iamlegacy.net/uploads/1/3/2/7/132740435/8245398.pdf
    • http://files.nataliekosnar.com/uploads/1/3/0/9/130969686/pixonimawudip-xolixib-rujopilefenitol.pdf
    • http://files.breannpattyphotography.com/uploads/1/3/1/4/131438190/fuxoxipugojigew.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/malaria_treatment_in_pregnancy.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/24525679909.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9560/files/63319908311.pdf
    • https://cdn.shopify.com/s/files/1/0437/5304/6165/files/learning_pencil_sketch.pdf
    • https://cdn.shopify.com/s/files/1/0432/0133/1364/files/hannah_arendt_eichmann_in_jerusalem_summary.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/silixogexazowitakupav.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/natilesepaniwejer.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/78340915065.pdf
    • https://cdn.shopify.com/s/files/1/0439/7232/9630/files/pueblos_de_puerto_rico.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/7757237163.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_off0000a615.bin
17ffe5a2641058e86ff545600b043d0c820aef4ff264cafe67aefb1b1f85dba1
pdf-font-stream PDF embedded font (sfnt) at offset 0xA615 5508 bytes
font_01_sfnt_off0000b8be.bin
64e225fd5cd67556da55f38882d2e5e01e6266efbf2646f66cc5869da2e32c39
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BE 11072 bytes