Malicious PDF — malware analysis report

Static analysis result for SHA-256 8247feba78e38248…

MALICIOUS

PDF

42.0 KB Created: 2020-07-31 18:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6b3c306ad782a2b718818f864448915 SHA-1: 83ef900a1a7eb2aa4f8b05e6f43c67ad6b22681a SHA-256: 8247feba78e38248a0773b8201920d542d5534cd66ef9c51316293329ba978a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate a PDF link farm and malicious redirector activity, suggesting the document's primary purpose is to direct users to potentially harmful websites. 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.ru/pify?keyword=bbg+workout+pdf
    • http://files.secretbutterflyboutique.com/uploads/1/3/0/7/130776255/bixikowusi.pdf
    • http://files.tfexpo.net/uploads/1/3/1/4/131438474/wizipomudo_fitidonovijidi.pdf
    • http://files.gracewithlight.com/uploads/1/3/0/7/130740018/famamura_dopatebolezi_bakaxoxit_zabatiwanikum.pdf
    • http://files.learningtobuyahome.com/uploads/1/3/1/3/131384145/5941752.pdf
    • http://files.arlingtonmsband.com/uploads/1/3/1/6/131606087/ddee7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80023348890.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7275/files/97975742656.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8070/files/43097030410.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/xefonanutes.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9283/files/lonifateta.pdf
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/relagurizafupekiwiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/wakoxodizujilurifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pekuxiwitijumowiviw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutuxajaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/zijokisizividepiluzifed.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006661.bin
9ff828ddbcdbe54414d4560946e877e955f5eb7978cab1600defba841b80c289
pdf-font-stream PDF embedded font (sfnt) at offset 0x6661 5136 bytes
font_01_sfnt_off00007803.bin
34fbdbe29b2310d847614903d319c680af990bb04d5326d57cbd9c799885d32e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7803 10176 bytes