Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6abded1cd7dc94…

MALICIOUS

PDF

56.9 KB Created: 2020-07-22 12:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce33e7e336dfef971b14b32a30208d07 SHA-1: 3bda4db948b3c676b9a7ad6aef3fd783f69f44ae SHA-256: 1f6abded1cd7dc94aa756ef40d4ee6412dbcdc5e22d4c3a86f5c0aa52855952f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to a known malicious redirector. The primary malicious URL identified is ttraff.ru, which is used to redirect users to other sites. The document body is heavily obfuscated and appears to be generated content, further supporting a malicious intent to drive traffic to malicious infrastructure.

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.ru/pify?keyword=faringitis+bacteriana+y+viral+pdf
    • http://files.sofl.afaparents.org/uploads/1/3/1/4/131408970/df11d.pdf
    • http://files.milamcountybiz.com/uploads/1/3/1/3/131379874/zemisap.pdf
    • http://files.lynnpetersongallery.com/uploads/1/3/0/7/130738988/5990471.pdf
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/fibexodaxul.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/jinafupuxikegubaruxuso.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6165/files/temumup.pdf
    • https://bolazeboju.files.wordpress.com/2020/06/60745691749.pdf
    • https://fidedafekulo.files.wordpress.com/2020/06/58762066111.pdf
    • https://vikukixiv.files.wordpress.com/2020/06/74941924720.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/todewaluxazufagaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/16395722241.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/galuvutijofaxukizojinuzi.pdf
    • https://cdn.shopify.com/s/files/1/0440/9029/4437/files/63631289055.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/88517426946.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53940500656.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_off0000a121.bin
a39412a80803adb3816ff2043bb26b94c6c7b8f03c9e6e1b083d583ad8eb83a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xA121 5256 bytes
font_01_sfnt_off0000b312.bin
54190083a2af86b827516ee754c23f721e272488a856848d1db8cb553f05b86c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 10272 bytes