Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9851ab6b4837840…

MALICIOUS

PDF

42.8 KB Created: 2020-08-09 03:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 116b4c69ff9a3045ca97df38c78f838c SHA-1: 25085a60f78938dc4b470eb9ea3190a11800271c SHA-256: b9851ab6b48378403bb83309bc67988b83a26d0544fd4bd273dcb64f9da53617
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a primary link directing users to a known malicious redirector at 'ttraff.ru'. This redirector is designed to lure victims into clicking through to potentially harmful content, disguised by the document's text. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to external sites.

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=basic+knowledge+of+computer+software+pdf
    • http://files.creativationevents.com/uploads/1/3/1/8/131856772/1290035.pdf
    • http://files.maverickarthealing.com/uploads/1/3/2/7/132740501/59b332e99cd2ef.pdf
    • http://nolukij.catherinemadigan.com/uploads/1/3/1/6/131637881/8097229.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/tijimuneget.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/99933304746.pdf
    • https://cdn.shopify.com/s/files/1/0427/8507/9452/files/86110754869.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/vengeance_sample_pack.pdf
    • https://cdn.shopify.com/s/files/1/0438/9135/9899/files/54641321628.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/18869602451.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/66411007371.pdf
    • https://cdn.shopify.com/s/files/1/0437/2843/7409/files/89421145776.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/84469756006.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9692/files/41794010668.pdf
    • https://cdn.shopify.com/s/files/1/0431/8114/6280/files/249146987.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_off0000682b.bin
ac87ea54f2c4c2ad05d706e7f2dca0b403b00cef40b279fd4aa06094332a0da2
pdf-font-stream PDF embedded font (sfnt) at offset 0x682B 5680 bytes
font_01_sfnt_off00007b88.bin
0f039d5241dd9da121a463259d31ec7ed89ce81a787a8f4319bbfef8039800f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B88 10272 bytes