Malicious PDF — malware analysis report

Static analysis result for SHA-256 f394ba5cb16c72d5…

MALICIOUS

PDF

49.7 KB Created: 2020-08-20 06:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5718f3f0e9bb5ad7b38f248529a8ad0 SHA-1: bd9579794657ad22109d0e4d70e5d1b4d1c58056 SHA-256: f394ba5cb16c72d5b81a75da1b5d2f18565baab2c0434f8f7d06566f21f0dc25
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious URL, disguised as a template download. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=wordpress+discussion+forum+template
    • http://lenenapu.vinnysblogbookcom.com/uploads/1/3/1/1/131164250/nojedura.pdf
    • https://cdn.shopify.com/s/files/1/0433/9462/9788/files/difeno.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6519/files/xixedefalakidadewanage.pdf
    • https://cdn.shopify.com/s/files/1/0435/7783/5681/files/57180575876.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/91085781134.pdf
    • https://cdn.shopify.com/s/files/1/0431/3976/0295/files/bsa_committee_meeting_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/xutilafalavatu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5978/files/alice_munro_corrie.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/33876578004.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4985/files/wuzadowob.pdf
    • https://cdn.shopify.com/s/files/1/0437/5933/7621/files/alexa_app_android_version_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/77968172836.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/25496366309.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_off00008714.bin
9db626e7b52b308ca7143504fc7381f43bc0b4781282b718fd4d483bf07f92d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8714 5312 bytes
font_01_sfnt_off00009919.bin
acfcf8574a1b6a9fe179abf6328da96d9774198c7b39c0d964a55f8a0fb14ed6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9919 9508 bytes